Review for 10.1186/s12876-021-01898-z (2021)

Reviewer’s report
Title: 
Utility of the Narrow-band imaging International Colorectal
Endoscopic classification for optical diagnosis of colorectal polyp histology in
clinical practice: a retrospective study
Version: 
1 
Date: 
07 Jun 2021
Reviewer's report:
Thanks to the authors' efforts to address the raised questions. 
While several
issues have been clarified, there is still a struggle to understand what is new in
this study. The study, given that the data was from 2011-2013 is not able to
provide answer to challenging areas including HP, which have more recently
been better examined and reported by more recent data. This is a good study in
itself but has not added to current understanding. The explanation of the
participants' experience in addressing better performance is not really clear. It
implies that all prior studies were performed by inexperienced endoscopists.
Also, the contention that most other studies were in research context is not
completely accurate. Acceptance or otherwise of this paper is at the discretion of
the editors, provided the journal allows for results that are well presented but not
necessarily an advancement to current knowledge.
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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?
No