Review for 10.1186/s12876-020-01457-y (2020)

Reviewer ’s report  
 
Title: Underwater versus conventional endoscopic mucosal resection  for small size 
nonpedunculated colorectal polyps ：A randomized controlled trial  
 
Version: 1 Date:  19 Jul 2020  
 
Reviewer's report:  
 
Additional file 2: Figur e S1. Forest plot of risk difference for primary outcome.  
Figure S1 is a key figure of this manuscript. Therefore, the author should attach this figure to the 
main manuscript not to supplementary file.  
At this rate, the readers cannot understand this figu re.  
The author should improve this figure.  
1.The author should add the caption of the figure below the horizontal axis (for example; favors 
UEMR, favors CEMR)   
2.The number of horizontal axis ( -0.1, 0.1, 0.2) is not correct.  
The author should revise the se numbers as correct.  
3.The risk difference of complete resection in per -protocol analysis and En -block resection rate 
in ITT analysis are not correct. I think these numbers has been replaced.  
 
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Yes 
 
Are the methods appropriate and well described?  
If not, please specify what is required in your comments to the authors.  
 
Yes 
 
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If not, please specify which controls are required in your comments to the author s. 
 
Yes 
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Yes 
 
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additional statistical review?  
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assessment in your comments to the editors.  
 
I recommend additional statistical review  
 
Quality of written English  
Please indicate the quality of language in the manuscript:  
 
Needs some language corrections before being published  
 
Declaration of competing interests  
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1.  Have you in the past five years received reimbursements, fee s, funding, or salary 
from an organisation that may in any way gain or lose financial ly from the 
publication of this manuscript, either now or in the future?  
 
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lose financiall y from the publication of this manuscript, either now or in the 
future?  
 
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of the manuscript?  
 
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that holds or has applied for patents relating to the content of the manuscript?  
 
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6.  Do you have any non -financial competing interests in relation to this paper?  
 
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below. If your reply is yes to any, please give details below.  
 
Non 
 
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