1 Department of General Surgery, E-Da Cancer Hospital, Kaohsiung, Taiwan School of Medicine, College of Medicine, I-Shou University, Kaohsiung, Taiwan Department of Medical Education and Research, E-Da Cancer Hospital, Kaohsiung, Taiwan Department of General Surgery, E-Da Hospital, Kaohsiung, Taiwan College of Medicine, I-Shou University, Kaohsiung, Taiwan Department of Anesthesiology, E-Da Hospital, Kaohsiung, Taiwan Department of Anesthesiology, E-Da Cancer Hospital, Kaohsiung, Taiwan Department of Medical Imaging and Radiology, Shu-Zen Junior College of Medicine and Management, Kaohsiung, Taiwan Department of Emergency Medicine, E-Da Hospital, Kaohsiung, Taiwan School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan.