Chieh-Ni Kao1, Yu-Wei Liu2. 1. Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung Medical University, No. 100, Tzyou 1st Road, Kaohsiung, 80756, Taiwan. 2. Department of Surgery, Kaohsiung Medical University Hospital, Kaohsiung Medical University, No. 100, Tzyou 1st Road, Kaohsiung, 80756, Taiwan. nipma6714@gmail.com.