Review for 10.1186/s12876-023-02862-9 (2023)

Reviewer’s report
Title: 
A New Classification of Periampullary Diverticulum: Cannulation of
Papilla on the Inner Margins of the Diverticulum (Type IIa) is More Challenging
Version: 
0 
Date: 
05 Jan 2023
Reviewer: 
Jan Trna
Reviewer's report:
Very interesting topic, good work on well organized research. I just have a little
comment. I find it somewhat unfortunate to clasify the diverticula I-III and I-IV
from opposite sides - in older classification system type I is papila inside the
diverticulum and in proposed newer classification this is type IV. 
I think this
might cause confusion in future, but since the classification is already published
(World J Gastroenterol. 2020;26(19):2403
‐
 2415), there is not much what we can
do about it.
I would recommend 2 comments:
1. in the article name I would refraze to A New Division of Periampullary
Diverticulum: Cannulation of papila on the inner margins of the diverticulum
(Type III) is More Challenging to make the main message clearer from the first
moment. 
2. the first sentence pf Discussion - PAD is often detected during physical
examinations. Do you mean imaging methods? Because PAD CANNOT be
detected by physical examination.
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