1. Gastroenterology, National Taiwan University Hospital, Taipei, Taiwan
2. Gastroenterology, Sacramento VA Medical Center, VANCHCS, Mather, CA and UC Davis Medical Center, Sacramento, California, USA
3. Gastroenterology, Mackay Memorial Hospital, Taipei, Taiwan
4. Gastroenterology, Sepulveda ACC, VAGLAHS, David Geffen School of Medicine at UCLA, North Hills, California, USA