1. Division of Gastroenterology, Department of Medicine; Buddhist Dalin Tzu Chi General Hospital; Chia-Yi
2. School of Medicine; Buddhist Tzu Chi University; Hwalien
3. Division of Gastroenterology and Hepatology; Department of Internal Medicine; Taipei Medical University Hospital; Taipei Taiwan
4. School of Medicine; Taipei Medical University; Taipei Taiwan
5. Department of Mathematics; National Chung Cheng University; Chia-Yi
6. Veterans Affairs Greater Los Angeles Healthcare System; Sepulveda Ambulatory Care Center; North Hill
7. David Geffen School of Medicine at UCLA; Los Angeles California USA