1. Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
2. Division of Gastroenterology, Department of Internal Medicine, Chung Shan Medical University Hospital, Taichung, Taiwan
3. School of Medicine, Chung Shan Medical University, Taichung, Taiwan
4. Department of Pathology, Chung Shan Medical University, Taichung, Taiwan
5. Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei 115, Taiwan