1. Department of Surgery, Pusan National University Yangsan Hospital, Gyeongnam 626-770, Republic of Korea
2. Biomedical Research Institute, Pusan National University Hospital, Pusan 602-739, Republic of Korea
3. Department of Internal Medicine, Pusan National University Yangsan Hospital, Gyeongnam 626-770, Republic of Korea
4. Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Gyeongnam 626-770, Republic of Korea