Review for 10.1186/s12876-021-02037-4 (2021)

Reviewer’s report
Title: 
Validation and modification of existing mortality prediction model for
lower gastrointestinal bleeding: A retrospective study
Version: 
1 
Date: 
09 Sep 2021
Reviewer's report:
Author should check the manuscript, and fix up the parts where it doesn't make
sense.
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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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