1. Department of Internal Medicine Faculty of Medicine, University of Medicine and Pharmacy at Ho Chi Minh city Ho Chi Minh City Vietnam
2. Department of Gastroenterology Cho Ray Hospital Ho Chi Minh City Vietnam
3. Department of Clinical Pharmacy Faculty of Pharmacy, University of Medicine and Pharmacy at Ho Chi Minh city Ho Chi Minh City Vietnam
4. Thong Nhat Hospital Ho Chi Minh City Vietnam