Review for 10.1186/s12876-016-0512-6 (2016)

Reviewer ’s report  
 
Title: COMPARISON OF DOUBLE -BALLOON AND SINGLE -BALLOON ENTEROSCOPE  
FOR THERAPEUTIC ENDOSCOPIC RETROGRADE CHOLANGIOGRAPHY AFTE R 
ROUX -EN-Y SMALL BOWEL SURGERY  
 
Version: 0 Date: 15 May 2016  
 
Reviewer: Sushil Ahlawat  
 
Reviewer's report:  
 
Interesting study comparing success of balloon enteroscopy in p erforming ERCP in patients with 
altered anatomy. I would like the authors to point out limitations of  this study, retrospective case 
series, selection bias since there was no ran domization involve d. In addition, did authors use 
other endoscope such as pediatric colonoscope? How does success of balloon enteroscopy 
compare with pediatric colonoscope? What about spiral enteroscope? Some have used this 
method for deep enteroscope. How  did author determine exact length of rouex limb? Were 
operative notes available in all patients and was length specified? What about break down of 
success with respect to intubating enteroenteric anastomosis only but not able to intubate biliary 
enteric l imb, reaching up to ampulla but failure in cannulation, and complete success? How do 
author explain findings of RCTs comparing single vs double balloon enteroscope, which 
conclude that DBE reaches deeper then why DBE was not more successful than SBE in ERC P. 
Authors should also compare their results in discussion with a US study (ref #20) and explain 
differences.  
 
 
 
 
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 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 manuscr ipt: 
 
Acceptable  
 
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