1. Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
2. Division of Gastroenterology, Department of Internal Medicine, Nantou Hospital, Ministry of Health and Welfare, Nantou City, Taiwan
3. Division of Allergy, Immunology and Rheumatology, Department of Medicine, Chung Shan Medical University Hospital, Taichung, Taichung, Taiwan
4. Department of Healthcare Administration, Central Taiwan University of Science and Technology, Taichung, Taiwan
5. Division of Gastroenterology, Department of Internal Medicine, Chung Shan Medical University Hospital, Taichung, Taichung, Taiwan