1. Division of Gastroenterology, Department of Internal Medicine, Kaohsiung Armed Forces General Hospital, No. 2, Zhongzheng 1st Road, Lingya District, Kaohsiung City 802, Taiwan
2. Division of Gastroenterology, Department of Internal Medicine
3. Division of Pathology, Tri-Service General Hospital, National Defense Medical Center, No. 325, Chengong Road, Section 2, Neihu Taipei 114, Taiwan