Review for 10.1186/s12876-021-01636-5 (2021)

Reviewer’s report
Title: 
A prognostic model for stratification of stage IB/IIA esophageal squamous
cell carcinoma: a retrospective study
Version: 
0 
Date: 
25 Sep 2020
Reviewer's report:
This article does not contribute enough new things.
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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?
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from apparent manipulation?
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