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: 
0 
Date: 
27 Sep 2021
Reviewer's report:
Please state better the indications given by the radiologist in order to use coils+
gelform or coils+ particles ( for example in hospital availability, costs, expertise)
Please mention the cost for each material ( coils, microparticles, gelfoam) used.
Please evaluate typos errors 
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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?
Yes
Are the methods sufficiently described to allow the study to be repeated?
Yes
Is the use of statistics and treatment of uncertainties appropriate?
Yes
Is the presentation of the work clear?
Yes
Are the images in this manuscript (including electrophoretic gels and blots) free
from apparent manipulation?
Yes