1. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Taipei Medical University Hospital, Taipei 11031, Taiwan, R.O.C.
2. Department of Medical Research, Cathay General Hospital, Taipei 10630, Taiwan, R.O.C.
3. Division of Gastroenterology, Department of Internal Medicine, Cathay General Hospital, Taipei 10630, Taiwan, R.O.C.
4. School of Medicine, College of Medicine, Fu Jen Catholic University, New Taipei 24205, Taiwan, R.O.C.