1. Department of Medicine, College of Medicine and Health Sciences, Sultan Qaboos University, P.O. Box 35, 123 Muscat, Oman
2. Department of Gastroenterology, Royal Victoria Hospital, McGill University Health Center, Montreal, QC, Canada H3A 1A1
3. Department of Medicine, Royal Victoria Hospital, McGill University Health Center, Montreal, QC, Canada H3A 1A1
4. Department of Gastroenterology, Jewish General Hospital, McGill University, Montreal, QC, Canada