1. Division of Hepatogastroenterology, Department of Internal Medicine; Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine; Kaohsiung; Taiwan
2. Division of Gastroenterology, Department of Internal Medicine; Kaohsiung Veteran General Hospital and National Yang-Ming University; Kaohsiung; Taiwan
3. Cancer Center, Division of Gastroenterology, Department of Internal Medicine; Kaohsiung Medical University Hospital, Kaohsiung Medical University; Kaohsiung; Taiwan