Review for 10.1186/s12876-020-01441-6 (2020)

Reviewer’ s report
Title: Efficacy, Safety and Drug Survival of Thioguanine as Maintenance Treatment for
Inflammatory Bowel Disease: A Retrospective Multi-Centre Study in the United Kingdom
Version: 2Date: 16 Aug 2020
Reviewer's report:
I suggest to clearly state in the title of the study that this is a retrospective study to avoid
ambiguity.I believe that authors responded to all comments of previous reviewers.
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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?Yes
Is the use of statistics and treatment of uncertainties appropriate?
YesIs the presentation of the work clear?YesAre the images in this manuscript (including electrophoretic gels and blots) free from apparent
manipulation?
Yes