Review for 10.1186/s12876-021-01755-z (2021)

Reviewer’s report
Title: 
Optimal Timing of Endoscopic Retrograde Cholangiopancreatography for Acute Cholangitis
Associated with Distal Malignant Biliary Obstruction
Version: 
0 
Date: 
02 Feb 2021
Reviewer's report:
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First of all this is a retrospective study and data must be interpreted very cautiously
We need data about the stent inserted in the patients
Are there any differences due to type of stent inserted (plastic vs metallic?)
Explanation about the need to dilate the stricture
Causes of death are not reported and this is a big limit (especially in the 30 days mortality due to stents
malfunction and 180 days mortality due to the cancer type)
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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?
Yes
Are the methods sufficiently described to allow the study to be repeated?
Yes
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Yes
Is the presentation of the work clear?
Yes
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manipulation?
Yes