Review for 10.1186/s12876-020-01361-5 (2020)

Reviewer ’s report  
 
Title: Cap-assisted endoscopy increases ampulla of Vater visualization in high -risk patients   
 
Version: 0 Date: 03 Mar 2020  
 
Reviewer: Naoki Hosoe  
 
Reviewer's report:  
 
This is an interesting and a well -designed study conducted by Silva et al.  The authors evaluated 
the efficacy of transparent cap which is placed in the tip of the endoscope on Familial 
adenomatous polyposis patient. Only one comment is described as follow s. 
 
1. All endoscopy were performed by three resident doctors. This study shows the efficacy of cap -
assisted endoscopy only in beginners. Isn't transparent cap effectiveness as low as if performed 
by an expert endoscopist? Please discuss this limitation.  
 
 
Are the methods appropriate and well described?  
If not, please specify what is required in your comments to the authors.  
 
Yes 
 
Does the work include the necessary controls?  
If not, please specify which controls are required in your comments to the authors.  
 
Yes 
 
Are the conclusions drawn adequately supported by the data shown?  
If not, please explain in your comments to the authors.  
 
Yes 
 
Are you able to assess any statistics in t he manuscript or would you recommend an  
additional statistical review?  
If an additional statistical review is recommended, please specify what aspects require further  
assessment in your comments to the editors.  
 
I am able to assess the statistics  
 
Quality of  written English  
Please indicate the quality of language in the manuscript:  
 
Acceptable  
 
Declaration of competing interests  
Please complete a declaration of competing interests, considering the following questions:  
 
1. Have you in the past five years received  reimbursements, fees, funding, or salary from an  
organisation that may in any way gain or lose financially from the publication of this  
manuscript, either now or in the future?  
 
2. Do you hold any stocks or shares in an organisation that may in any way gai n or lose  
financially from the publication of this manuscript, either now or in the future?  
 
3. Do you hold or are you currently applying for any patents relating to the content of the  
manuscript?  
 
4. Have you received reimbursements, fees, funding, or salar y from an organization that 
holds  or has applied for patents relating to the content of the manuscript?  
 
5. Do you have any other financial competing interests?  
 
6. Do you have any non -financial competing interests in relation to this paper?  
 
If you can answer no to all of the above, write 'I declare that I have no competing interests' 
below.  If your reply is yes to any, please give details below.  
 
I declare that I have no competing interests.  
 
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on my report to the authors and, if the manuscript is accepted for publication, my named report  
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I agree to the open peer review policy of the journal