1. Department of Surgery, Taichung Veterans General Hospital, Chung-Shan Medical and Dental College, Taichung, and Department of Surgery, School of Medicine, National Yang-Ming University, Taipei, Taiwan
2. Department of Pathology, Taichung Veterans General Hospital, Chung-Shan Medical and Dental College, Taichung, and Department of Surgery, School of Medicine, National Yang-Ming University, Taipei, Taiwan