Document Type : Review Article
Authors
1 Department of Gastroenterology and Hepatology, Mashhad University of Medical Sciences, Mashhad, Iran.
2 Student Research Committee, Islamic Azad University, Mashhad Branch, Mashhad, Iran.
3 Department of Internal Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
4 Department of Internal Medicine, University of Toronto, Toronto, Canada.
Abstract
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