1 1] Division of Gastroenterology, Department of Medicine, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan [2] Tzu Chi University, School of Medicine, Hualien, Taiwan.
2 1] Sepulveda Ambulatory Care Center, Veterans Affairs Greater Los Angeles Healthcare System, North Hill, California, USA [2] David Geffen School of Medicine at UCLA, Los Angeles, California, USA.