¹Division of Gastroenterology, Department of Medicine, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan

²Tzu Chi University, School of Medicine, Hualien, Taiwan

³Sepulveda Ambulatory Care Center, Veterans Affairs Greater Los Angeles Healthcare System, North Hill, California, USA

⁴David Geffen School of Medicine at UCLA, Los Angeles, California, USA

Correspondence: Yu-Hsi Hsieh, MD, Division of Gastroenterology, Department of Medicine, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, 2 Minsheng Road, Dalin, Chiayi 62247, Taiwan. E-mail: hsieh.yuhsi@msa.hinet.net

The authors declare no conflict of interest.