Review for 10.1186/s12876-020-01429-2 (2020)

Reviewer’ s report
Title: Usefulness of peroral cholangioscopy in the differential diagnosis of IgG4-related sclerosing
cholangitis and extrahepatic cholangiocarcinoma: a single-center retrospective study
Version: 2Date: 29 Jul 2020
Reviewer's report:
All questions had been answered
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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 presented?
YesAre the methods sufficiently described to allow the study to be repeated?YesIs the use of statistics and treatment of uncertainties appropriate?
Yes
Is the presentation of the work clear?YesAre the images in this manuscript (including electrophoretic gels and blots) free from apparent
manipulation?
Yes