Review for 10.1186/s12876-021-02046-3 (2021)

Reviewer’s report
Title: 
Comparison of different embolic particles for superior rectal arterial
embolization of chronic hemorrhoidal bleeding: gelfoam versus microparticle
Version: 
1 
Date: 
17 Nov 2021
Reviewer's report:
No further revisions are needed
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Is the study design appropriate to answer the research question (including the use
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