The conclusion is reliable only based on three retrospective studies with limited patients?
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Dr. Meng-Si Luo drafted the letter, and Dr. Guan-Jiang Huang revised the letter.
Compliance with ethical standards
Conflict of interest
The authors declares that they have no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
- 2.Higgins JPT, Green S (2011) Cochrane handbook for systematic reviews of interventions version 5.1.0 [updated March 2011]. In: The Cochrane Collaboration, 2011. https://www.cochrane-handbook.org.