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: 1Date: 28 May 2020
Reviewer's report:
Most questions were responded and answered in detail. I had only one comment
1. Author added six references [Ref 35-40] for Spyglass in Discussion sesion. I think 3 or 4references may be more appropirate.
Are the methods appropriate and well described?
If not, please specify what is required in your comments to the authors.
YesDoes the work include the necessary controls?
If not, please specify which controls are required in your comments to the authors.
YesAre the conclusions drawn adequately supported by the data shown?
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Yes
Are you able to assess any statistics in the manuscript or would you recommend an
additional statistical review?If an additional statistical review is recommended, please specify what aspects require furtherassessment in your comments to the editors.
I am able to assess the statisticsQuality of written English
Please indicate the quality of language in the manuscript:
AcceptableDeclaration of competing interests
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