1. Rheumatology Research Center, Razi Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
2. Department of Rheumatology, Iran University of Medical Sciences, Tehran, Iran
3. ENT and Head and Neck Research Center and Department, Iran University of Medical Sciences, Tehran, Iran
4. Division of Gastroenterology and Hepatology, Johns Hopkins Medical Institutions, Baltimore, MD, USA