Endoscopy.  [electronic resource] 

 -  The American journal of gastroenterology  Oct 2014 
 - S444-593 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1572-0241 
<br/><br/><label>Standard No.: </label>10.1038/ajg.2014.283  doi