Review for 10.1186/s12876-020-01360-6 (2020)

Reviewer ’s report  
 
Title: Associati on Between Charlson Comorbidity Index and Complications of Endoscopic  
Resection of Gastric Neoplasms in Elderly Patients  
 
Version: 0 Date: 27 Apr 2020  
 
Reviewer's report:  
 
1) Were all sedation performed by anethesiologists or gastroenterologists?  
2) Was there any patient receive endotracheal intubation during endoscopic surgery?  
3) How was the a ntiplatelet agents discontinued and resumed for endoscopic procedure?  
4) Please define the time -period for "post -procedural" complications  
5) Was there any difference between elderly patients with low and high CCI scores after 
endoscopic resection in terms  of mid - or long -term survival, and tumor recurrence ?  
6) Please expand the contents of discussion parts, such as the application of CCI score for 
other clinical settings, other scoring or prognostic system for elderly patients after advanced 
endoscopic pr ocedures…?  
 
Are the methods appropriate and well described?  
If not, please specify what is required in your comments to the authors.  
 
Yes 
 
Does th e 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 the 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:  
 
Needs some language corrections before being published  
 
Declaration of competing interests  
Please complete a declaration o f 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, eith er now or in the future?  
 
2. Do you hold any stocks or shares in an organisation that may in any way gain 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 salary 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 inte rests?  
 
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.  
 
I agree to the open peer review policy of the journal. I understand that my name will be included  
on my report to the authors and, if the manuscript is accepted for publication, my named report  
including any attachments I  upload will be posted on the website along with the authors'  
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CC-BY license ( http://creativecommons.org/licenses/by/4.0/ ). I understand that any comments  
which I do not wish to be included in my named report can be included as confidential comments  
to the editors, which will not be published.  
 
I agree to the open peer review policy of the journal