Review for 10.1186/s12876-020-01491-w (2020)

Reviewer’s report
Title: 
Adverse events of video capsule endoscopy over the past two decades: a
systematic review and proportion meta-analysis
Version: 
0 
Date: 
09 Sep 2020
Reviewer's report:
This is an interesting review and meta-analysis about overall adverse events of
video capsule endoscopy and I have not major methodological concerns.
Minor points:
Patency capsule reduced retention rate by 5.04%. On the other hand its use is not
recommended by European guidelines. Also, the authors should mention the
potential complications (obstruction and perforation) of patency capsule as
recently reported in case reports.
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Is the study design appropriate to answer the research question (including the use
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presented?
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