Review for 10.1186/s12876-020-01590-8 (2021)

Reviewer’s report
Title: 
Utility of a 21-gauge Menghini-type biopsy needle with rolling method for an endoscopic
ultrasound-guided histological diagnosis of autoimmune pancreatitis: a retrospective study
Version: 
0 
Date: 
10 Oct 2020
Reviewer's report:
This paper reported "Utility of a 21-gauge Menghini-type Biopsy Needle for an Endoscopic
Ultrasoundguided
Histological Diagnosis of Autoimmune Pancreatitis".
Authors mentioned the usefulness of this needle and rotation method. It is an interesting topic in this field.
However, there are many biases and problems.
Queries and comments
1. Very small sample cases. Menghini-type group included only 14 cases.
2. The selection of these devices for use was dependent on the
period and the endoscopists' preference. It is the very important bias.
3. Conventional-type group included many kinds and size of needles. Procore is the quite different kinds
of needles.
4. Menghini-type is not a special needle. EZ SHOT3 is an also Menghini-type needle. Why is this needle a
biopsy needle? Why is this needle a special one?
Please explain the structural peculiarity in detail.
5. Please explain the rotation method in detail. It is not enough.
6. How many cases did authors perform the rotation method? How to confirm the safety of rotation
method.
7. Recently, EUS-FNB needles are very common. Author should mention and compare with FNB needles.
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Yes
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