1 Division of Gastroenterology, Department of Medicine, An Nan Hospital, China Medical University, Tainan, Taiwan.
2 Gastroenterology and Hepatology Section, Department of Medicine, Baylor College of Medicine, Houston, TX, USA; Department of Environmental and Preventive Medicine, Oita University, Faculty of Medicine, Oita, Japan.
3 Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan; Chang Gung University College of Medicine, Taoyuan, Taiwan.
4 Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung City 807, Taiwan. Electronic address: gi@kmu.edu.tw.