Review for 10.1186/s12876-020-01586-4 (2021)

Reviewer’s report
Title: 
Clinical features and outcomes of combined hepatocellular carcinoma and
cholangiocarcinoma versus hepatocellular carcinoma versus cholangiocarcinoma
after surgical resection: A propensity score matching analysis
Version: 
2 
Date: 
06 Dec 2020
Reviewer's report:
Overall comments to the Author
Thank you for your revisions. The author's have addressed the concerns raised.
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Is the study design appropriate to answer the research question (including the use
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