1. Division of Gastroenterology, Department of Medicine, E-Da Hospital, I-Shou University, Kaohsiung, Taiwan;
2. Division of Gastroenterology, Department of Medicine, E-Da Dachang Hospital, I-Shou University, Kaohsiung, Taiwan;
3. Division of Gastroenterology, Department of Medicine, E-Da Cancer Hospital, I-Shou University, Kaohsiung, Taiwan;
4. School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan.