1. Department of Gastroenterology, Nhan Dan Gia Dinh Hospital, Ho Chi Minh, Vietnam
2. Department of Internal Medicine, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh, Vietnam
3. Laboratory Department, Vinmec Central Park International Hospital, Ho Chi Minh, Vietnam
4. Department of Pathology, Nhan Dan Gia Dinh Hospital, Ho Chi Minh, Vietnam
5. Department of Endoscopy, Nhan Dan Gia Dinh Hospital, Ho Chi Minh, Vietnam
6. Hunter Medical Research Institute, New Lambton Heights, New South Wales, Australia
7. School of Medicine and Public Health and NHMRC Centre of Research Excellence Digestive Health, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, New South Wales, Australia