1. Department of Medical Education, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
2. Endoscopy Center, Changhua Christian Hospital, Changhua, Taiwan
3. School of Medicine, Chung Shan Medical University, Taichung, Taiwan
4. Department of Surgical Pathology, Changhua Christian Hospital, Changhua, Taiwan
5. Department of Pathology and Laboratory Medicine, Taichung Veterans General Hospital, Taiwan