1. Department of Surgery; Asan Medical Center, University of Ulsan College of Medicine; Seoul Republic of Korea
2. Department of Medicine; School of Medicine, Konkuk University; Seoul Republic of Korea
3. Department of Internal Medicine; Catholic Blood and Marrow Transplantation Center, Seoul St. Mary's Hospital, Catholic University of Korea; Seoul Republic of Korea
4. Department of Stem Cell Biology; School of Medicine, Konkuk University; Seoul Republic of Korea
5. Department of Surgery; Ulsan University Hospital, University of Ulsan College of Medicine; Ulsan Republic of Korea