Abstract
Context
Pain is commonly experienced among patients after surgical procedures. Clinical pain management after surgery is far from being successful. Patients may control postoperative pain by self-administration of intravenous opioids using devices designed for this purpose (patient-controlled analgesia or PCA). PCA devices have been developed including the sufentanil sublingual tablet system (SSTS). A systematic review of the use of SSTS for postoperative pain is needed to identify an alternative method of pain management.
Objectives
To systematically review literature to establish the efficacy and the safety of PCA with SSTS used in the treatment of moderate-to-severe acute post-operative pain in a hospital setting.
Methods
Embase, MEDLINE, Google Scholar, and Cochrane Central Trials Register were systematically searched in December 2019 for studies examining SSTS for pain in adult after surgical procedures. The methodological quality of the studies and their results were appraised using the Consensus-based Standards for the Selection of Health Measurement Instruments (COSMIN) checklist and specific measurement properties criteria, respectively.
Results
Sixteen studies evaluating SSTS were included for a total of 2311 patients. All participants in the SSTS group reported NRS ≤ 4 within 24 h after surgery. Patient satisfaction was high, with a minimum of 70% satisfaction among patients treated with SSTS. The most common adverse events (AEs) overall for SSTS 15 and 30 mcg were nausea, vomiting, and headache. AEs observed in the studies were generally consistent with those associated with opioids and the postsurgical setting.
Conclusions
SSTS is an important system for the management of moderate-to-severe acute pain in a hospital setting. SSTS is well tolerated, with no unexpected adverse events (AEs) and no clinically meaningful vital sign changes. These data confirm the safety and tolerability of the SSTS. Successful pain management resulted in a high level of acceptance of the SSTS by patients with high satisfaction for the method of pain control.
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Avoid common mistakes on your manuscript.
70% of these patients experience acute post-operative pain. |
Sufentanil sublingual tablet system (SSTS) is a noninvasive route of administration to treat moderate-to-severe acute pain. |
Outcomes: pain intensity, adverse events, patient satisfaction. |
SSTS is a successful pain management system in a hospital setting. |
Safety and tolerability of the SSTS were confirmed. |
Introduction
Rationale
More than 234 million major surgical procedures are performed every year worldwide [1] and data suggest up to 70% of these patients experience moderate-to-severe pain postoperatively [2]. Post-operative pain should be alleviated as soon and as effectively as possible to reduce suffering and to facilitate rapid recovery and mobility, thereby improving patient outcomes [3]. However, clinical pain management after surgery is far from being successful [4]. In a national survey, approximately 80% of patients experienced acute pain after surgery. Of these patients, 86% had moderate, severe, or extreme pain. Referring to the numeric rating scale (NRS) pain intensity ratings, we can classify mild pain as 0–4, moderate pain as 5–6, and severe pain as 7–10. Almost 25% of patients who received pain medications experienced adverse effects. The most common side effects were drowsiness (41%), nausea (35%), constipation (26%), sleeplessness (18%), dizziness (14%), vomiting (14%), abdominal discomfort (10%), itching (10%), mood changes (8%), and difficult urination (8%) [4].
The international guidelines recommended the use of a multimodal analgesia. Analgesic medication and techniques combined with non-pharmacological interventions have additive or synergistic effects and more effective pain relief compared with single-modality interventions [5].
Patients may control postoperative pain by self-administration of intravenous opioids using devices designed for this purpose (patient-controlled analgesia or PCA). PCA shows a number of benefits when compared with non-PCA administration of opioids. These include more effective analgesia, fewer analgesic gaps, and potentially shorter duration of stay in hospital, as well as high levels of patient satisfaction, as they are more in control of their own treatment.
Postoperative guidelines recommend oral over intravenous opioids in patients who can use the oral route [5]. Consequently, PCA devices have been developed including the sufentanil sublingual tablet system (SSTS). In July 2014, the Food and Drug Administration (FDA) approved the opioid analgesic Zalviso® to delivery 15 mcg of sufentanil. In October 2018, the FDA approved the opioid analgesic Dsuvia® to deliver 30 mcg of medical treatment.
The goal was to provide a noninvasive route of administration to treat moderate-to-severe acute pain in non-opioid-tolerant patients, as the current rapidly acting transmucosal opioid analgesic products are approved for opioid-tolerant cancer patients only.
Objectives
The aim of the current study was to conduct a systematic literature review to establish the efficacy and safety of PCA with SSTS used in the treatment of moderate-to-severe acute post-operative pain in the hospital setting.
Methods
Protocol and Registration
We performed a systematic review based on preferred reporting items for systematic reviews and meta-analyses (PRISMA) statement [6], and following a protocol written prior to starting the review. This article is based on previously conducted studies and does not contain any studies with human participants or animals performed by any of the authors.
Eligibility Criteria
The population, intervention, comparison, and outcome (PICO) criteria were applied to the research question. Patients of at least 18 years undergoing major surgical procedures were considered as the population (P); the intervention (I) was postoperative analgesia with SSTS 15 mg or SSTS 30 mg; the comparison (C) concept was not applicable to the research question; pain intensity, adverse events (AEs) and patient satisfaction after using SSTS for postoperative analgesia in patients undergoing major surgical procedures were considered the outcomes (O) for this systematic review. We included observational study, clinical trial, and randomized controlled trial published from 2000 to the present.
PICO criteria are summed in Table 1.
Literature Search
We identified the articles by searching electronic databases (Embase, MEDLINE, Google Scholar, and Cochrane Central Trials Register). Other relevant studies were identified from the reference lists of systematic reviews and meta-analyses.
We used a combination of terms for “sufentanil sublingual tablet system”, “post-operative or postsurgical pain”, “observational study”, “clinical trial”, and “randomized clinical trial”. We applied no language restrictions in searches. The initial search was performed in December 2019.
The studies included in this review evaluated adult patients clinically diagnosed with moderate-to-severe acute post-operative pain in a hospital setting following any type of surgery.
Primary Outcomes
The primary outcome was the pain intensity assessed via NRS at 12 and 24 h. Pain intensity data assessed by means other than a 0–10 NRS were normalized to such a scale. Some studies reported the sum of pain intensity difference (SPID) at 12, 24, and 48 h.
Secondary Outcomes
We extracted data on the following secondary outcomes:
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1.
Adverse events;
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2.
Patient satisfaction.
Selection of Studies
We determined eligibility by reading the abstract of each study identified by the search. We eliminated studies that clearly did not satisfy our inclusion criteria, and obtained full copies of the remaining studies. Two review authors read these studies independently and reached agreement by discussion.
The methodological quality of the included studies was evaluated and rated using the COSMIN checklist, which has a four-point rating scale [7, 8].
Data Extraction and Management
Data extracted included the following:
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Age and sex of participants;
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Number of participants enrolled and completing the study;
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Type of operation;
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Pain intensity for all time points at which it was measured;
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PCA settings (bolus dose, lockout, limit dose);
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Patient satisfaction;
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Severity or incidence of adverse events.
Results
The flow diagram (Fig. 1) shows the results from the literature search and the study selection process. Sixteen studies met the eligibility criteria (see Table 2).
According to the COSMIN checklist, all studies included in this review showed an excellent-to-good quality. The majority of clinical trials had a low risk of bias. Observational studies cannot, by design, offer establish causality through features such as randomization and concealment of allocation. In contrast, threats to validity and precision from performance bias, detection bias, inadequate sample size, and lack of study efficiency did not appear relevant in the study selection.
In the included studies, 2311 patients were treated with SSTS: 1343 females and 821 males (Costa F, 2019 and Lakshman S, 2016 did not reported sex of participants) with mean age of 55.5 ± 8.9 years (Costa F, 2019 did not reported age of participants).
Four studies (Hutchins JL, 2017; Lakshman S 2016; Miner JR, 2018; Minkowitz HS, 2017) evaluated the safety and efficacy of SST 30 mcg for the management of postoperative pain. Other papers evaluated SSTS 15 mcg.
The largest study involved 341 patients (Pogatzki-Zahn E, 2019), while the smallest consisted of 16 patients (Rispoli M, 2018). All analyzed studies were conducted in inpatient settings.
Patients underwent various operation; the most common surgeries were abdominal procedures (eight studies: Hutchins JL, 2017; Lakshman S, 2016; Meijer F, 2018; Melson TI, 2014; Minkowitz HS, 2017; Pogatzki-Zahn E, 2019; Ringold FG, 2015; Turi S, 2019) and orthopedic surgery (eight studies: Dransart C, 2018; Hutchins JL, 2017; Jove M, 2015; Meijer F, 2018; Melson TI, 2014; PogatzkiZahn E, 2019; Scardino M, 2018; Van Deen DE, 2018), followed by gynecological (three studies: Leykin Y, 2019; Pogatzki-Zahn E, 2019; Turi S, 2019) and thoracic procedures (three studies: Costa F, 2019; Meijer F, 2018; Rispoli M, 2018).
The most frequent lockout interval was 20 min in 12 studies evaluating SSTS 15 mcg. In other papers, evaluating SSTS 30 mcg lockout intervals were not reported, except for Hutchins JL 2017 (minimum 60-min redosing interval).
In ten studies (Costa F, 2019; Dransart C, 2018; Jove M, 2015; Leykin Y, 2019; Meijer F, 2018; Minkowitz HS, 2017; Pogatzki-Zahn E, 2019; Rispoli M, 2018; Scardino M, 2018; Turi S, 2019), the cumulative dosage of SSTS at 24 h after surgery was reported. The mean dose of sufentanil was 190.74 (± 77.07) mcg. Other papers considered different intervals (Hutchins JL, 2017; Miner JR 2018) or not reported the cumulative dose of SSTS. Figure 2 displays SSTS consummation during pain treatment.
Pain Intensity
Different investigators recorded this outcome on different scales and at different intervals. We normalized all NRS to a 0–10 range (see Fig. 3). The majority of authors reported pain intensity between 12 and 24 h after surgery. One study, Miner JR 2018, reported NRS at 2 h. Pain intensity over the first 24 h was reported in 12 studies, which involved 2327 patients with 1844 in the SSTS group. All participants in SSTS group reported NRS ≤ 4 within 24 h after surgery. Only one trial, Van Deen DE 2018, recorded NRS at 12 h of 5 and at 24 h of 4.5. It is important to point out that this is the highest pain score recorded among patients treated with SSTS. At 48 h of treatment, all participants showed NRS ≤ 4.
Three RCT (Lakshman S, 2016; Melson TI, 2014; Minkowitz HS, 2017) reported time-weighted summed pain intensity difference to baseline (SPID) over 12 or 24 h. These studies involved 679 participants with 391 in the SSTS group and 288 in the control group. Participants in the SSTS group reported higher SPID values than those in the control group.
General anesthesia was used for most surgical procedures. Regional or local anesthesia was used in six studies (Jove M, 2015; Meijer F, 2018; Pogatzki-Zahn E, 2019; Rispoli M, 2018; Scardino M, 2018; Van Deen DE, 2018). Pain medication with opioids and non-opioids intraoperatively and/or early postoperatively was often administered before initiating the SSTS. A paper (Costa F, 2019) reported the use of intravenous preemptive analgesia. Three studies (Hutchins JL, 2017; Lakshman S, 2016; Miner JR, 2018) did not reported data concerning pain medication.
Ten studies (Hutchins JL, 2017; Jove M, 2015; Leykin Y, 2019; Meijer F, 2018; Melson TI, 2014; Miner JR, 2018; Minkowitz HS, 2017; Ringold FG, 2015; Rispoli M, 2018; Scardino M, 2018) reported the use of rescue medication if analgesia with SSTS was insufficient. A total of 112 participants in seven studies required rescue medication (e.g., IV morphine, oral morphine, oral oxycodone, acetaminophen, ketorolac). In Rispoli M 2018, a patient reported severe pain and a single-shot para-vertebral block was performed.
Patient Satisfaction
Patient satisfaction results were presented as different degrees subjective satisfaction levels. We normalized all to “satisfied/not satisfied”.
Thirteen studies were available for analysis of satisfaction (see Fig. 4).
Adverse Events (AEs)
An adverse event is defined as any undesirable experience associated with the use of a medical product in a patient. A total of 958 AEs were recorded. A study, Lakshman S 2016, did not reported the number of AEs. The most frequently reported AEs were nausea, vomiting, and PONV (postoperative nausea and vomiting), headache, and oxygen desaturation (see Table 3 and Fig. 5). Most studies did not specify the timing of adverse events.
Nausea, Vomiting, and PONV
Nausea was the most frequent AE (492 events, 51% of AEs), following by vomiting and PONV. In nine studies (Dransart C, 2018; Jove M, 2015; Leykin Y, 2019; Meijer F, 2018; Ringold FG, 2015; Rispoli M, 2018; Scardino M, 2018; Turi S, 2019; Van Deen DE, 2018), prophylaxis was administered; in the other studies, prescription of antiemetic drugs was missed or not reported.
Headache
The incidence of headache was reported in six studies (Hutchins JL, 2017; Jove M, 2015; Lakshman S, 2016; Melson TI, 2014; Minkowitz HS, 2017; Turi S, 2019) and a total of 55 cases were reported. Only in one study, Minkowitz HS 2017, acetaminophen was administered to treat headache.
Respiratory depression In all studies, oxygen saturation was considered critical if it could not be maintained more than 95% with or without supplemental oxygen. Moreover, a respiratory rate of less than 8 breaths/min was alarming. Eight studies (Hutchins JL, 2017; Jove M, 2015; Meijer F, 2018; Melson TI, 2014; Miner JR, 2018; Pogatzki-Zahn E, 2019; Ringold FG, 2015; Turi S, 2019) reported data for respiratory depression. A total of 54 cases of reduced oxygen saturation were documented.
Dizziness The incidence of dizziness was evaluated in seven studies (Hutchins JL, 2017; Melson TI, 2014; Minkowitz HS, 2017; Pogatzki-Zahn E, 2019; Ringold FG, 2015; Scardino M, 2018). A total of 41 cases were reported.
Pruritus
A total of 37 cases were reported in four studies (Jove M, 2015; Melson TI, 2014; Minkowitz HS, 2017; Ringold FG, 2015). In two studies, Jove M 2015 and Ringold FG 2015, pruritus was statistically higher in the SSTS versus placebo group (4.7 vs. 0%).
Constipation
Two studies (Jove M, 2015; Melson TI, 2014) reported constipation for a total of 35 AEs.
Others
Hypotension was reported in three studies (Jove M, 2015; Melson TI, 2014; Minkowitz HS, 2017) for a total of 28 AEs. Melson TI 2014 reported four cases of orthostatic hypotension. A total of 28 cases of somnolence and insomnia were reported in three studies (Jove M, 2015; Miner JR, 2018; Minkowitz HS, 2017). Confusional state or sedation occurred 16 times in three studies (Jove M, 2015; Meijer F, 2018; Melson TI, 2014). Others AEs were dyspepsia (Melson TI, 2014), itching (Leykin Y, 2019), anxiety (Ringold FG, 2015), urinary retention (Melson TI, 2014), delirium (Meijer F, 2018), erythema (Scardino M, 2018), hypertension (Ringold FG, 2015) and pyrexia (Ringold FG, 2015).
Serious Adverse Events (SAEs)
Eight studies reported data related to serious adverse events. A total of 35 SAEs were reported among patients treated with SSTS; only 17 were considered related to treatment: oxygen saturation decreased, sinus tachycardia, and confusional state from Jove M 2015; three PONV from Leykin Y 2019; one report of angina pectoris from Miner JR 2018; bradycardia, oxygen desaturation, low respiratory rate, and sopor from Pogatzki-Zahn E 2019; respiratory depression and nausea/vomiting from Turi S 2019. Among all patients receiving SSTS, there was no death considered related to treatment.
Withdrawals Due to Adverse Events or Lack of Efficacy
A total of 233 participants (10%) withdrew from 12 studies. Twelve studies reported on withdrawals due to adverse events, lack of efficacy, or others. A total of 80 withdrawals (34%) due to adverse events were reported from eight studies (Hutchins JL, 2017; Jove M, 2015; Leykin Y, 2019; Melson TI, 2014; Pogatzki-Zahn E, 2019; Ringold FG, 2015; Turi S, 2019; Van Deen DE, 2018).
Withdrawals due to lack of efficacy were reported for nine studies (102 participants, 43%) (Hutchins JL, 2017; Jove M, 2015; Melson TI, 2014; Miner JR, 2018; Minkowitz HS, 2017; Pogatzki-Zahn E, 2019; Ringold FG, 2015; Rispoli M, 2018; Turi S, 2019).
Fifty-one participants withdrew from seven studies (Dransart C, 2018; Melson TI, 2014; Miner JR, 2018; Minkowitz HS, 2017; Pogatzki-Zahn E, 2019; Ringold FG, 2015; Van Deen DE, 2018) due to other reasons.
Discussion
Sufentanil acts selectively at the μ-opioid receptor to produce analgesia. It is one of the most potent opioids used in clinical practice. Sufentanil has a potency 7–10 times greater than that of fentanyl and 500–1000 times greater than that of morphine, but a therapeutic index markedly higher than that of fentanyl, morphine, and other opioids [25].
The bioavailability of sublingual sufentanil is 60%, much more than 9% of the oral route. When administered sublingually, it shows a rapid onset of action due to its high lipophilicity. Lipophilic, nonionized drug molecules have rapid uptake from sublingual tissues into the plasma as well as rapid uptake from the plasma to the μ-opioid effector site in the central nervous system. It is mainly metabolized in the liver and enterocytes of the small intestines [26].
Sublingual sufentanil provided effective analgesia for adults with moderate-to-severe acute pain reducing the intensity of pain within 15–30 min after the first dose and maintaining analgesic benefit over the 2–24 h.
The sufentanil sublingual tablet system makes use of a hand-held dispenser system. The sufentanil dose of the sufentanil sublingual tablet system is fixed and only one lockout interval is available. In our review, the mean dose of sufentanil (190.74 ± 77.07 mcg) was lower than the maximum dose recommended. Lockout interval was the one expected for SSTS 15 mcg (20 min) and for SSTS 30 mcg (60 min). All surgeries forecast severe acute pain. In Miner JR 2018, the feasibility of using SSTS 30 mcg for moderate-to-severe pain management in the emergency department (ED) was evaluated. Sufentanil sublingual was administered for a maximum of 72 h and discontinued before patients left the healthcare setting.
Pain Intensity
Pain intensity on a numeric rating scale (NRS) was lower than 4 in participants using SSTS at 12 and 24 h, with the exception of results reported by Van Deen DE 2018, which showed a trend towards higher scores. In this study, sublingual sufentanil did not improve postoperative pain management in patients undergoing total knee arthroplasty and increased nausea compared to patients receiving oxycodone with or without dexamethasone.
We considered NRS lower than 4 as optimal cut-off point between mild and moderate pain. This cut-off was identified as the tolerable pain threshold [27].
In Miner JR 2018, SSTS 30 mcg was evaluated over 2 h for managing moderate-to-severe acute pain in an ED setting. Mean pain intensity was 7.6 at baseline and decreased to 4.5 at 60 min and remained relatively stable (4.6) at 2 h. Based on the experience of Cepeda MS 200 [3, 28], this decrease in NRS score is meaningful of “much/very much” improvement.
In the RCTs reporting the summed pain intensity difference to baseline over the 12 and 24-h study period, SPID values were higher than the control group.
A total of 112 patients received upon request rescue medication if analgesia with the study medication was insufficient. Discontinuation due to inadequate analgesia occurred at low rates (4.4% of total participants).
Patient Satisfaction
Patient satisfaction was high, with a minimum of 70% satisfaction among patients treated with SSTS. It is not surprising to find greater satisfaction with SSTS. Patients have a greater degree of autonomy which reduces fears of insufficient analgesia. Instant availability of the medication contributes to greater satisfaction with the mode of treatment. The measurement of satisfaction in trials where participants are not blinded to study arm assignment creates a potential for bias. Most of the studies in our analysis were unblinded.
Safety
The most common AEs overall for SSTS 15 and 30 mcg were nausea, vomiting, and headache. As with any opioid, SSTS may be associated with respiratory or neuropsychiatric events, particularly in a postoperative setting where patients are recovering from anesthesia or have been administered concomitant CNS depressants, including other opioids during the surgery and during the initial stay in the recovery room. The most common respiratory AE was decreased oxygen saturation (5.6% of AEs). Three patients discontinued due to respiratory AE. Neuropsychiatric events among patients treated with sufentanil were headache (5.7%), dizziness (4.3%), confusional state/sedation (1.7%), somnolence (1.6%), and insomnia (1.4%). Discontinuation due to neuropsychiatric events occurred at low rates; specific events leading to discontinuation included confusional state and sopor. The most common gastrointestinal AEs were nausea (51%), vomiting (11.6%), PONV (4.2%), and constipation (3.6%). No patient required the use of naloxone. AEs observed in the studies were generally consistent with those associated with opioids and the postsurgical setting.
A total of 35 SAEs were reported among patients treated with SSTS; only 17 were considered related to treatment: one SAE occurred in a SSTS 30 mcg treated patients, the others in the SSTS 15 mcg group. All events were resolved, with the study drug withdrawn.
The safety profile of sufentanil is well established based on more than 30 years of experience with sufentanil used for general anesthesia and for epidural analgesia.
Other PCAs
Two studies (Dransart C, 2018; Melson TI, 2014) compared SSTS vs. PCA with IV morphine. Patients using SSTS reported more rapid onset of analgesia and patient and nurse ease of care and satisfaction scores were higher than IV PCA. Adverse events were similar between the two groups. No other studies have been performed to compare SSTS to other PCAs.
Conclusions
In summary, the SSTS is an important system for the management of moderate-to-severe acute pain in a hospital setting. SSTS is well tolerated, with no unexpected AEs and no clinically meaningful vital sign changes. These data confirm the safety and tolerability of the SSTS. Successful pain management resulted in a high level of acceptance of the SSTS by patients with high satisfaction for the method of pain control.
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Acknowledgements
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No funding or sponsorship was received for this study or publication of this article.
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All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship for this article, take responsibility for the integrity of the work as a whole, and have given their approval for this version to be published.
Authorship Contributions
Luca Gregorio Giaccari helped design the study, conduct the study, analyze the data, and write the manuscript; Francesco Coppolino helped design the study, conduct the study, and analyze the data; Caterina Aurilio helped design the study and analyze the data; Valentina Esposito helped design the study and analyze the data; Maria Caterina PACE helped design the study and analyze the data; Antonella Paladini helped design the study and analyze the data; Maria Beatrice Passavanti helped design the study and analyze the data; Vincenzo Pota helped design the study and analyze the data; Pasquale Sansone helped design the study, conduct the study, analyze the data, and write the manuscript.
Disclosures
Luca G. Giaccari, Francesco Coppolino, Caterina Aurilio, Valentina Esposito, Maria Caterina Pace, Antonella Paladini, Maria Beatrice Passavanti, Vincenzo Pota and Pasquale Sansone have nothing to disclose.
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This article is based on previously conducted studies and does not contain any studies with human participants or animals performed by any of the authors.
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Giaccari, L.G., Coppolino, F., Aurilio, C. et al. Sufentanil Sublingual for Acute Post-Operative Pain: A Systematic Literature Review Focused on Pain Intensity, Adverse Events, and Patient Satisfaction. Pain Ther 9, 217–230 (2020). https://doi.org/10.1007/s40122-020-00166-4
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DOI: https://doi.org/10.1007/s40122-020-00166-4