Shuo-Ying Dai1, Chun-Ting Chiang2, Po-Chuan Chen3, Ying-Yuan Chen1. 1. Division of Thoracic Surgery, Department of Surgery, National Cheng Kung University Hospital, Tainan, Taiwan. 2. Division of Pathology, National Cheng Kung University Hospital, Tainan, Taiwan. 3. Division of Colorectal Surgery, Department of Surgery, National Cheng Kung University Hospital, Tainan, Taiwan.