Text and Data Mining valid from 2019-01-12
First Online: 12 January 2019
Compliance with Ethical Standards
: The Ethical Committee of the Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, approved this research (IR.SBMU.RIGLD.REC.1396.681).
: The authors declare that they have no conflict of interest.
: The authors have nothing to disclose.