Review for 10.1186/s12876-015-0353-8 (2015)

Reviewer’s report  
Title: Trends in upper gastrointestinal diagnosis over four decades in Lusaka, Zambia: a  
retrospective analysis of endoscopic findings  
 
Version: 0 Date: 22 Jul 2015  
 
Reviewer: P. Marco Fisichella  
 
Reviewer's report:  
 
The authors offer a longitudinal perspective of gastrointestinal disease in a region of Africa.  
The manuscript is well written and original. The authors have put a lot of efforts in developing 
the database and I believe the results of this study deserve attention. In addition, the 
interobserver variation between raters seems to have been addressed ad equately.  
 
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 control s? 
If not, please specify which controls are required in your comments to the 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 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.  
 
Not relevant to this man uscript  
 
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, consideri ng 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, e ither n ow 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, e ither 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 fin ancial competing interests?  
 
6. Do you have any non -financ ial 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' 
responses. I agree for my report to be made available under a n Open Access Creative Commons 
CC-BY license ( http://creativecommons.org/licenses/by/4.0/ ). I understand that any comments 
which I do not wish to be included i n 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