Review for 10.1186/s12876-020-01597-1 (2021)

Reviewer’s report
Title: 
Prevalence and risk factors of bowel symptoms in Korean patients with
ulcerative colitis in endoscopic remission: a retrospective study
Version: 
1 
Date: 
14 Nov 2020
Reviewer's report:
I think the Authors has made a good revision.
I think should be accurately explained how many patients couldn't be evaluated
for calprotectine and for serum levels of biologics to better understand how's
composed your sample.
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Is the study design appropriate to answer the research question (including the use
of appropriate controls), and are the conclusions supported by the evidence
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