Summary
Background
Minimally invasive techniques have replaced the conventional open approach in many operations. For esophagectomy, it took quite a long time to become routine even in centers. The aim of this review was to demonstrate history and current status of minimally invasive esophagectomy and also robotic-assisted esophagectomy with its associated techniques.
Methods
Selected literature on minimally invasive surgery for esophageal cancer was identified using a PubMed search for the period 1990–2018 with the search terms esophagectomy, minimal invasive, robotic, indocyanine fluorescein, enhanced recovery after surgery (ERAS), fast-track, nerve monitoring and its permutations.
Results
Within the last two decades minimally invasive esophagectomy has found its way into clinical practice. It reduces perioperative morbidity with equivalent oncological outcome. It allows for better pulmonary results, less blood loss, less pain, and better quality of life. If robotic assisted esophagectomy helps to further improve the results is currently under investigation. Fast-track protocols have proven their value. Intraoperative nerve monitoring and indocyanine green fluorescein imaging of the perfusion of the gastric tube can lower perioperative complications.
Conclusions
Minimally invasive surgery for esophageal malignancies offers advantages when performed in an environment with sufficient expertise and caseload. Whether robotic-assisted minimally invasive esophagectomy further improves the results has to be investigated in the future. Intraoperative nerve monitoring and visualization of the graft perfusion with indocyanine green fluorescein should be used where available. Enhanced recovery protocols after surgery have become standard.
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Introduction
During the 1990s, minimally invasive approaches rapidly became standard in Europe for many indications in abdominal surgery like cholecystectomy, appendectomy and hernia repair. In these technically easier procedures, the advantages of the open approach were so obvious and the learning curve was steep so that no surgical unit could spare it. Patients even asked for it. Moreover, since the competence in minimally invasive techniques grew rapidly in the surgical community, more demanding procedures followed and also found their place in daily routine. Sigma resections, laparoscopic colon resections, fundoplications, Heller myotomies and left pancreatic resections also became standard when specialized teams formed.
Of note, in about the same time period the treatment of most diseases became more complex so that the subspecialization within what we call “general surgery” went on. Subdivisions of upper gastrointestinal (GI) surgery (covering esophagus and bariatric/metabolic surgery), coloproctology, hepatobiliopancreatic surgery, transplant surgery, thoracic surgery, hernia and abdominal wall surgery, endocrine surgery and also breast surgery formed, mostly in close cooperation with the theme-associated disciplines like oncologists, gastroenterologists and so on.
Very early, pioneers of laparoscopic surgery were aiming to push the limits of what can be done minimally invasively. However, in these laparoscopic and video-assisted thoracoscopic (VATS) high-end procedures, it took longer to become widespread all over the world. Therefore, redo-surgeries, bariatric, colorectal, lung, pancreas and esophagus surgery were only added later to the list of what we call routine nowadays. Even some of them have not become routine yet. This has two reasons: on the one hand, they have a flatter (slower) learning curve and therefore demand a specialized dedication and on the other hand, the advantages of the minimally invasive approach is not so obvious that surgeons feel the strong need to do it. To the author’s opinion, minimally invasive esophagus resections are a good example for that.
In 1992 Cushieri reported on endoscopic esophagectomy through a right thoracoscopic approach for the first time, followed by a series of several groups [1]. Nowadays, many specialized centers have implemented this technique. Nevertheless, the routine use of minimally invasive esophageal surgery is still under debate and is therefore not yet adopted in a widespread manner.
The aim of this review was to demonstrate history and current status of minimally invasive esophagectomy and also robotic-assisted esophagectomy with its associated techniques that are currently utilized in order to enhance safety.
Patients and methods
Review of selected literature on minimally invasive surgery for esophageal cancer. A PubMed search was performed for the period 1990–2018 with the search terms esophagectomy, minimal invasive, robotic, indocyanine green fluorescein, ERAS, fast track, nerve monitoring and its permutations. The selection of the papers was performed on discretion of the author, mainly driven by exclusivity, number of patients, and the level of evidence. Nevertheless, almost all “significant” publications on the topic are mentioned and cited.
Results
History of minimally invasive esophagectomy
As noted above, Cushiery already reported on five cases of endoscopic esophagectomy through a right thoracoscopic approach, followed by a paper on 26 procedures in 1994 [1, 2]. Consequently, surgeons all over the world worked with empathy and dedication to develop minimally invasive techniques of the existing different variations of esophageal resections [3,4,5,6,7,8,9,10,11]. Namely transhiatal, transthoracic and three-field (abdominal–thoracic-–cervical) approaches found their position and therefore a more common use for a minimally invasive approach [10, 12,13,14,15,16,17,18,19]. In Austria, some specialized departments used their highly developed minimally invasive skills to perform minimally invasive esophageal resections with good outcomes even without publishing their experiences, e. g., Schmid T, Innsbruck and Szinicz G., Bregenz, Austria (personal communication). Others reported on small series more focused on feasibility [20,21,22,23,24,25], operative technique [26,27,28] and perioperative outcome [11, 29] than on oncological long-term data, quality of life or even cost analysis.
Thereafter in the 1990s and early 2000s, high-volume expert centers formed and as soon as the first large series were published [3], others felt justified to “try this at home”. Nowadays, there are several well-known expert centers on minimally invasive esophagectomy (MIE) all over the world, developing better evidence on the various applied techniques, indications and outcomes. However, only 15% of esophagectomies worldwide are performed by using the conventional laparoscopic-thoracoscopic or robotic approach [30], although better global quality of life, physical function, fatigue, and pain 3 months after surgery have been demonstrated [31].
The newest kids on the block were implementation of telemanipulators called “operation robots” and the integration of enhanced vision such as HD-cameras and 3D imaging [32]. ICG-visualization of organ perfusion and the application of electric nerve stimulation, both with the aim to improve the patients’ outcome, are also on their way to find their place in daily routine. All of them will be discussed below.
Procedure choice: transthoracic, transhiatal and cervical access
Presently there is no gold standard technique for esophagectomy. The choice of the technique strongly depends on tumor location and surgeons’ preference and experience with one or the other technique. The most commonly applied minimally invasive approaches are combined abdominal and transthoracic approaches using the tube-shaped stomach pull-up as a substitute for the resected esophagus (Fig. 1). Two techniques, with the anastomosis intrathoracically (Ivor-Lewis) (Fig. 2 and 3) or in the left neck (McKeown) are the most used [33, 34]. Both of them provide an en bloc resection of the esophagus together with radical mediastinal lymph node dissection under direct visualization [35]. However, open transhiatal esophagectomy (THE; i. e. abdominal approach to the mediastinum, through the diaphragm) is still under debate as an alternative with lower morbidity in some, but not in all studies [36,37,38]. With avoiding single lung ventilation, it was considered a technique for rather unfit patients. Nevertheless, the extent of lymph node dissection in the upper mediastinum is very limited from the abdomen keeping in mind that even in adenocarcinoma of the distal esophagus, the rate of positive lymph nodes in the upper mediastinum was as high as 10% in some studies! Therefore, transhiatal resections might show worse oncologic outcomes. However, laparoscopic or robotic assisted transhiatal esophagectomy has been shown to be an even lesser invasive alternative. Laparoscopic THE was demonstrated to be safe and feasible with evidence of reduced blood loss and shorter hospital stay. However, level 1 evidence is lacking and also evaluation of long-term oncologic outcomes is warranted [39, 40].
Hybrid esophagectomy
Since minimally invasive techniques of esophagectomy are demanding, the implementation of such a program strictly depends on the previous experience of the team in high-end laparoscopic surgery as well as in minimally invasive thoracic surgery. The latter has found its way into daily routine relatively later than laparoscopy and the number of experts available to apply new techniques is scarce. Therefore, many teams around the world have adopted a so-called hybrid approach, using minimally invasive surgery in the field of their better expertise and combining it with a conventional access in the other compartment [41]. Some combine laparoscopy with thoracotomy while others prefer the thoracoscopic approach and perform the abdominal part of the operation by conventional midline laparotomy. Those preferring laparotomy argue that the mobilization of the gastric tube including a “Kocher’s maneuver” can be done more easily in an open way and that the main advantage of MIE lies in a less invasive thoracic part. On the other hand, those performing laparoscopy and thoracotomy rely on a “safer” performance of the intrathoracic anastomosis e. g. with oversewing the circular stapled anastomosis in order to avoid leaks. In the MIRO trial [42, 43], 200 patients were randomized to either HMIE (hybrid minimally invasive esophagectomy, with thoracotomy) or open Ivor-Lewis esophagectomy. As a result, HMIE demonstrated to have less postoperative major morbidity, specifically significantly less pulmonary complications. Moreover, in a recent 3‑year follow-up an overall survival of 67% (95% confidence interval [CI] 57–75) in the HMIE group versus 55% (95% CI 45–64) in the open-procedure group was demonstrated [44]. In the MIOMIE trial, an Austrian group compared open esophagectomy versus HMIE (with thoracotomy) as well. They could show that morbidity, mortality, and oncological long-term outcome were equal to the classical open Ivor Lewis approach [45, 46].
However, with enough expertise, both parts can be accomplished minimally invasively when a stepwise approach with proctoring from a high-volume reference center is available in order to steepen the learning curve. Complete MIE has shown to be better than HMIE in terms of postoperative pain and pulmonary complications [47].
Fellowships at high-volume centers, proctoring by experts and credentialing seems reasonable [48].
Like in other highly demanding surgeries like pancreatic resections, the technical term “learning curve” means morbidity, mortality, pain, fear and even high financial burden in daily practice. Osugy et al. have defined the number of 17 MIEs to establish basic skills and a number of 34 cases to attain a similar or better outcome than by conventional (open) approach [49]. In a consensus paper Visser et al. has determined consensus among European MIE experts and identified fundamental items required for training MIE [50].
Completely minimally invasive esophagectomy
Reviews and meta-analyses
To date, several reviews comparing conventional (open) with minimally invasive techniques are available.
In 2009, 10 case-controlled studies and one systematic review were analyzed [51]. To sum up, in MIE, less blood loss (577 vs. 312 ml), a reduction of overall complications (60.4 vs. 43.8%), a reduction of intensive care unit (ICU) stay (7.6 vs. 4.5 days) and a reduction of overall hospital stay (19.6 vs. 14.9 days) was demonstrated. In detail, pulmonary complications occurred in 22.9 vs. 15.1%, the number of mean lymph node harvest was 23.8 vs. 20.2, indicating a benefit for those patients who underwent minimally invasive esophagectomy (MIE).
A systematic review and meta-analysis of 12 studies (MIE vs. HMIE vs. OE) demonstrated no significant difference in 30-day mortality for MIE and HMIE compared to the OE. The minimally invasive procedures had significantly lower blood loss, shorter ICU stay, total hospital stay and respiratory complications compared to OE [52].
A recent meta-analysis including 1549 patients showed a reduced blood loss and a better 2‑year survival rate following MIE. Anastomosis leakage was similar compared to the open approach [53].
Randomized controlled trials
Luketich et al. from a dedicated high-volume center in Pittsburgh (UPMC) published a retrospective analysis of over 1000 patients who underwent MIE for cancer within 15 years. He draw the conclusion that MIE reduces perioperative complications entailing a quicker recovery, with a mortality rate of 1.6% [54].
Currently, several randomized and multicenter trials are available comparing MIE with conventional approaches.
In the prospective randomized TIME trial, Biere et al. [55] demonstrated a lower yield for pulmonary complications within the first two postoperative weeks in the MIE group (29 vs. 9%). Moreover, 34 vs. 11.9% were shown to have pulmonary in-hospital infections. For in-hospital mortality, one patient in the open esophagectomy group died from anastomotic leakage and two in the minimally invasive group from aspiration and mediastinitis after anastomotic leakage. The authors concluded that these findings provide evidence for the short-term benefits of minimally invasive esophagectomy for patients with resectable esophageal cancer. A follow-up study of their patients showed similar disease-free (36 vs. 40%) and overall (40 vs. 51%) 3‑year survival [56]. Nguyen et al. demonstrated similarly the feasibility and safety of MIE over the conventional open approach in 46 cases [4].
Moreover, Smithers et al. demonstrated a similar 3‑year survival rate in a study with 114 open, 309 thoracoscopic-assisted, and 23 total MIEs. The groups were comparable with respect to preoperative variables. The differences in the postoperative variables were less median blood loss in the thoracoscopic-assisted and total MIE groups versus open (400 vs. 300 vs. 600 ml). They found a longer time for total MIE versus thoracoscopic-assisted and open (330 vs. 285 vs. 300 min), a longer median time in hospital for open versus thoracoscopic-assisted versus total MIE (14 vs. 13 vs. 11 days) and less stricture formation in the open versus thoracoscopic-assisted versus total MIE (6.1 vs. 21.6 vs. 36%). There were no differences in lymph node retrieval for each of the approaches [4, 57].
In the ongoing randomized ROMIO trial, comparing MIE with hybrid with open esophagectomy, patients’ abdomen and thorax will be dressed all over postoperatively in order to blind the treating personnel regarding the evaluation of postoperative pain [58, 59]. Two more randomized trials are still ongoing and the results will be shown at a future date [35, 60].
Matched analysis
In a propensity score-matched comparison 652 OE versus 735 MIE (444 paired cases) with squamous cell carcinoma, Wang et al. found MIE to be superior in terms of operation time, blood loss, hospital stay, readmissions to ICU, major complications, quality of life, with a comparable number of retrieved lymph nodes and the same 2‑year overall survival rate [61].
Databases
Using the data from the Society of Thoracic Surgeon Database, 3780 esophageal resections were analyzed. Compared with open esophagectomy, MIE was shown to have longer operation times and a higher rate of reoperation, whereas overall morbidity and mortality were similar. This was interpreted as an effect of the learning curve [62].
A population-based national study of all English National Health Service Trusts from April 2005 to March 2010 included 75,502 esophagectomy procedures in an analysis. In all, 1155 of them were accomplished minimally invasive. There was no difference in 30-day mortality (4.3% vs 4.0%; P = 0.605) and overall medical morbidity (38.0% vs 39.2%; P = 0.457) rates between open and MIE groups, respectively. A higher reintervention rate was associated with the MIE group than with the open group (21% vs 17.6%, P = 0.006; odds ratio, 1.17; 95% confidence interval, 1.00–1.38; P = 0.040). It can be assumed that between 2005 and 2010, most of the centers were somehow within their learning curve … An actual update of the study would be interesting [63].
Robotic
In the early 2000s, the three-arm Da Vinci (Intuitive, Inc. Intl.) telemanipulator (so-called “operation robot”) attracted the surgeons’ interest and gained worldwide use [64]. In the Medical University Innsbruck, we performed all types of laparoscopic and thoracoscopic standard operations of that time by using it ([65,66,67,68,69,70,71,72,73,74]; Figs. 4, 5, 6 and 7). To sum up, so-called “standard” laparoscopic operations can easily be performed faster and cheaper with conventional laparoscopic technique by trained surgeons. The newer four-arm model of the DaVinci operation robot has several improvements with the potential of a better versatility and therefore lessens the degree to that an on-table assistant has to contribute to the operation in between the former large moving robot arms.
When it comes to esophageal resections, surgeons hope to overcome the shortcomings of conventional thoracoscopy with non-articulated instruments due to the fulcrum effect of the thoracic wall, the remote position of the diaphragmatic hiatus and the meticulous lymph-node dissection in the upper mediastinum, sparing the recurrent laryngeal nerve and the vagus nerve. Better maneuverability, motion scaling, tremor filter and particularly a much more comfortable working position for the surgeon promise a smoother workflow with hopefully better outcomes (Fig. 8). However, it will be difficult to prove a better clinical outcome for the patient compared to conventional MIE [75].
First series
Several studies have been published since the first description of robotic assisted minimally invasive esophagectomy (RAMIE) by Horgan et al. in 2003 [76]. However, they are difficult to compare since a wide spectrum of different techniques is used. Robotic assisted transhiatal esophagectomy (RATE) [39, 76, 77], robotic assisted McKeon esophagectomy (RAMIME) [78] and robotic assisted Ivor-Lewis esophagectomy (RILE) including various hybrid applications make it hard to compare them systematically [79, 80].
Reviews
Kumar et al. published a review on 295 procedures: The robot seems not to be an advantage for the abdominal part with its wide operation field from the lower border of the duodenum until far up into the lower mediastinum, the therefore necessary bidirectional view and the intraoperative position change of 90 degrees to the right for the creation of the feeding jejunostomy; therefore, the abdominal part is often performed by conventional laparoscopy. Nevertheless, for lymphadenectomy of the celiac axis, a transient use of the robot might be helpful. On the other hand, the remote areas in the mediastinum that have to be addressed for lymph node harvesting together with the need for precision to avoid damage of nerves and adjacent organs seem to be an ideal working field for the robot. Just as well, tumors in the upper mediastinum and remote paratracheal lymph node metastases are described as an ideal application field for the robot [81, 82].
The recently available studies on RAMIE are outlined shortly as follows:
Case series
In 2007, Kernstine et al. published the first series of RAMIME with a morbidity rate of 29% [78].
In 2012, Dunn et al. reported on 40 patients with RATE, having an anastomotic insufficiency rate of 25% and a stricture rate of 67%. He clearly showed improvement by the time indicating the learning curve, but a transhiatal approach still seems questionable [83]. In the same year, Boone et al. published 47 RAMIME with an overall morbidity of 46.5%. Retrospectively, compared to these open esophagectomies, a significant reduction in pulmonary complications was noted (57% vs. 33%) [84, 85].
Cerfolio et al. reported on 85 Ivor-Lewis esophagectomies between 2011 and 2015 with mixed technique, either laparoscopic or robotic abdominal and robotic assisted thoracoscopy. He calculated a major morbidity rate of 36.4%, but a considerably high mortality rate of 10.6%, mostly attributed to patient selection and anastomotic insufficiencies. Therefore, he changed the technique from hand sewn to stapled anastomosis. Moreover, patient selection was modified in terms of nutritional status, cardiopulmonary performance and risk factors related with liver disease [86, 87].
In 2014 Trugeda et al. [88] and in 2016 Bongiolatti et al. [89] reported on small initial series of RAMIE with hand sewn anastomoses with leak rates of 29 and 25%, respectively, and both series had a mortality rate of zero. Although more feasible than with conventional MIE, intrathoracic robotic hand sewn anastomoses are demanding. Hence, Haverkamp et al. [90] found in a recent worldwide survey among specialists that 77% of the experts preferred a stapled anastomosis in the thorax and a 64% preferred a hand-sewn anastomosis in the neck. Interestingly, more than half of cervical anastomoses’ insufficiencies leak into the chest, leading to more serious clinical consequences (ICU, length of stay, time to oral intake) than those that are confined to the neck [91].
Comparative studies
In 2012, Weksler et al. compared 11 RAMIE with 26 MIE patients. They failed to demonstrate a significant difference in postoperative morbidity, length of stay and number of retrieved lymph nodes [92].
Yerokun et al. also did not find any clear advantage for the robot over MIE: Perioperative outcomes and 3‑year oncological results in T1-3N0-3M0 cancers of the distal and middle esophagus were comparable. However, MIE and RAMIE patients had shorter hospital stay and a higher number of retrieved lymph nodes compared to OE [93].
Van der Sluis et al. compared 108 RAMIE patients with a conversion rate of 19%. A high number of R0 resections as well as a median number of 26 lymph nodes was shown. Of note, median follow-up was 58 months and 5‑year survival was 42% [94].
In 2017 Okusanya et al. from the Pittsburgh group (UPMC) published the results of 26 RAMIE cases, including 2 RAMIME and 23 RILE. Anastomotic leakage rate, number of retrieved lymph nodes and conversion rate was similar to their previously reported conventional MIE [95].
Kim et al. [82] and Park et al. [96] recently reported on the application of the operation robot for lymph node dissection in the upper mediastinum with a number of 10 lymph nodes in mean from the upper mediastinum with a recurrent laryngeal nerve palsy rate of 26.3%.
Randomized controlled trials
The latest publication is the so-called ROBOT trial, a single-center randomized controlled trial from an expert center in Utrecht, Netherlands. They assigned 112 patients comparing RAMIE versus open transthoracic esophagectomy (OE) and found that RAMIE resulted in a lower percentage of overall (59 vs. 80%), surgery-related and cardiopulmonary complications with lower postoperative pain, better short-term quality of life, and a better short-term postoperative functional recovery compared to OE. Oncological outcomes at a medium follow-up of 40 months were comparable and in concordance with the highest standards nowadays [97].
Database
One recent review uses the National Cancer Data Base (NCDB). It was queried for patients diagnosed with pathologic Stage 0‑III esophageal cancer from 2010–2015. Of 5553 patients that met criteria, 28.4% underwent MIE, 7.8% RAMIE, and 63.8% open esophagectomy. From 2010–2015 an increasing trend was seen for both minimally invasive approaches, with MIE surpassing the number of open esophagectomies. Unplanned 30-day readmissions, 30-day and 90-day mortality rates were not significantly different between the different groups. LOS was significantly shorter in MIE and RAMIE, compared to OE (9 vs. 9 vs. 10 day). MIE and RAMIE had comparable survival rates compared to OE with no significant differences in median overall survival estimates after propensity-score matching (log-rank p = 0.603); with a trend for increased survival in RAMIE. Both minimally invasive approaches had significantly higher median lymph node counts (15 vs. 17. vs. 13) which may provide important differences in postoperative upstaging. The authors draw the conclusion that trends in MIE use is surpassing the open approach. Minimally invasive approaches are becoming the preferred approach with non-inferior long-term results compared to open esophagectomies. A significantly higher lymph node yield was seen for RAMIE and MIE [98].
Lateral decubitus versus prone
Patient positioning for MIE or RAMIE is also under debate: lateral decubitus versus prone position is debated against each other [99, 100]. Prone position of the patient allows for easier dissection of the esophagus since gravity keeps lung and blood down, thereby enlarging the operative field. Therefore, single lung ventilation is not necessary, thus reducing venous shunting. Moreover, it is more ergonomic for the surgeon. On the other hand, lateral decubitus positioning of the patient makes it easier to reach the upper mediastinum in order to perform lymphadenectomy along the vagus nerve. For those coming from open surgery, it offers a similar anatomic aspect and is also better suitable for emergency conversion to open surgery. To overcome the shortcomings of both methods, a semi-prone positioning with turning the table to the surgeon’s needs seems to be a well-accepted compromise.
Three-dimensional imaging
For better visual depth perception, three-dimensional (3D) cameras seem promising and might even be a more viable technique over two-dimensions (2D) in terms of short-term outcomes for patients with esophageal cancer [32, 101, 102]. In the current operation robots, they are standard anyway.
Visualization of the gastric tube’s perfusion
Healing of the anastomosis depends mainly on perfusion of the gastric tube. Therefore, identification of a well-perfused part of the stomach for positioning the anastomosis is desirable. Imaging of the tube’s perfusion with indocyanine fluorescein angiography seems promising and might lower the rate of anastomotic insufficiencies. Additional technologies like image flattening, color segmented fluorescence, overlay mode and spy mode might help to standardize imaging of perfusion and even allow for working under fluorescence imaging. However, absolute quantification of blood flow is not possible and preliminary data are controversial (Fig. 9; [103,104,105,106,107,108,109,110]).
Nerve monitoring
Recurrent laryngeal nerve monitoring (RNM) in esophagectomy was performed for the first time in 2001 by Hemmerling et al. [111]. It took several years until its clinical usefulness had been proven either in the mediastinum or in the neck. It has no impact in operative time, but significantly reduces postoperative vocal cord palsy and consequently pulmonary complications [112,113,114,115,116,117,118,119,120].
Enhanced recovery/fast track protocols
Enhanced recovery after surgery (ERAS) protocols aim to preserve physiologic functions after surgery. Bed rest, opioids, long fasting, excessive intravenous fluid intake, tubes and drains etc. have been proven to be more harmful than beneficial in the majority of cases despite this was part of “surgical culture” since the ancient times of surgery. ERAS protocols have proven their value in almost all surgical subspecialties. Particularly patients after major surgeries including esophagectomy should profit from this newer fast-track philosophy. In the recent years, ERAS protocols also found their way into clinical practice enabling an improvement of the results and even lowering overall-costs for esophagectomy [121,122,123,124,125,126,127,128,129,130,131,132,133,134,135].
Conclusion
Minimally invasive esophagectomy reduces perioperative complications with equivalent oncological outcome. It allows for better pulmonary results, less blood loss, less pain and a better quality of life when performed by well-trained surgeons with a sufficient caseload. Transthoracic approaches are superior to transhiatal techniques. Population-based studies show discordant results from expert centers. Therefore, proctoring and credentialing are crucial. Whether robotic assisted esophagectomy helps to further improve the results is currently under investigation. Fast-track protocols can be considered standard. Intraoperative nerve monitoring should be applied where available. The value of fluorescent angiography imaging to prevent anastomotic leaks needs further investigation.
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Wykypiel, H., Schmid, T. & Gehwolf, P. Minimally invasive esophagectomy. memo 12, 24–35 (2019). https://doi.org/10.1007/s12254-019-0481-x
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DOI: https://doi.org/10.1007/s12254-019-0481-x