Liang-Jou Chen1, Ting-Wei Chang2, Po-Chih Chang3,4,5,6. 1. School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung City, Taiwan. 2. Department of Surgery, Kaohsiung Medical University Hospital/Kaohsiung Medical University, Kaohsiung City, Taiwan. 3. Division of Thoracic Surgery, Department of Surgery, Kaohsiung Medical University Hospital/Kaohsiung Medical University, Kaohsiung City, Taiwan. dr.changpochih@hotmail.com. 4. Weight Management Center, Kaohsiung Medical University Hospital/Kaohsiung Medical University, Kaohsiung City, Taiwan. dr.changpochih@hotmail.com. 5. Ph. D. Program in Biomedical Engineering, College of Medicine, Kaohsiung Medical University, Kaohsiung City, Taiwan. dr.changpochih@hotmail.com. 6. Department of Sports Medicine, College of Medicine, Kaohsiung Medical University, No. 100, Tzyou 1st Road, Kaohsiung City, 80756, Taiwan. dr.changpochih@hotmail.com.