Review for 10.1186/s12876-021-01690-z (2021)

Reviewer’s report
Title: 
Selected nasogastric lavage in patients with nonvariceal upper
gastrointestinal bleeding
Version: 
0 
Date: 
09 Feb 2021
Reviewer's report:
Eun Jeong Gong, et al evaluate the nasogastric lavage to help identify the UGIB
in patients with nonvariceal upper gastrointestinal bleeding. Although nothing
novel, it is interesting. I have some comments listed below: 
1. Authors conclude nasogastric lavage is useful for predicting the presence of
UGIB in patients with GBS ≤11. Authors should discuss if this finding alter the
real world practice. The bottom line is that, any selection of patients with non-
variceal UGIB for nasogastric lavage? 
2. For Asia patients, previous study showed patients with UGIB and GBS=0
received no endoscopic hemostasis by endoscopy. Please clarify the group. 
3. Which reference is used to divide into 3 different GBS groups?
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