Review for 10.1186/s12876-021-02007-w (2021)

Reviewer’s report
Title: 
A neutrophil-to-lymphocyte ratio-based prognostic model to predict
mortality in patients with HBV-related acute-on-chronic liver failure
Version: 
2 
Date: 
02 Aug 2021
Reviewer's report:
My concerns have been addressed. However, I recommend that you include more
recent references on the subject, such as: "Chiriac S. et al. Prognostic value of
neutrophil-to-lymphocyte ratio in cirrhotic patients with acute-on-chronic liver
failure. doi: 10.5152/tjg.2020.19838".
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Is the study design appropriate to answer the research question (including the use
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