Review for 10.1186/s12876-019-1127-5 (2019)

Reviewer ’s report  
 
Title: Adverse Events Associated with Colonoscopy; an Examination of Online Concerns  
 
Version: 1 Date: 04 Nov 2019  
 
Reviewer: Stanisław Hać 
 
Reviewer's report:  
 
The manuscript entitled Adverse Events Associated with Colonoscopy; an Examination of 
Online Concerns is an extraordinary try of populational study of adverse efect freequency after 
uncomplicated colonoscop y. Authors use the interestin tool an internet search engine. The 
system of data filtration with querying symptoms and relation to users asking about colonoscopy 
and the system of data validation according to date of the colonoscopy seems very interesting.  
The clinical hypothesis about the freeqency of adverse efects of colonoscopy not reportet in 
hospital databases is also very modern.  
 
The manuscript give new insight into the problem. In my opinion is of value for readers of BMC 
Gastroenterology.  
 
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 t he authors.  
 
Unable to assess  
 
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 manus cript or would you recommend an 
additional statistical review?  
If an additional statistical review is recommended, please speci fy 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 qua lity 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 salar y 
from an organisation that may in any way gain or lose financial ly from the 
publication of this manuscript, either now or in the future?  
 
2.  Do you hold any stocks or shares in an organisation t hat may in any way gain or 
lose financially from the publicati on 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 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 decla re 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 f or publication, my named report 
including any attachments I upload will be posted on the website along with the authors' 
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which I do not wish to be included in my named report can be in cluded as confidential comments 
to the editors, which will not be published.  
 
I agree to the open peer review policy of the journal