1 Division of Gastroenterology, Department of Medicine, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, 2 Minsheng Road, Dalin, Chiayi, 62247, Taiwan. hsieh.yuhsi@msa.hinet.net.
2 School of Medicine, Buddhist Tzu Chi University, Hualien, Taiwan. hsieh.yuhsi@msa.hinet.net.
3 Graduate Institute of Long-Term Care, Tzu Chi University of Science and Technology, Hualien, Taiwan.
4 Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada.