1. Division of Vascular and Transplant Surgery, Department of Surgery, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Biomedicine and Health Science, The Catholic University of Korea, Seoul, Korea.
3. Department of Surgery, Kangdong Sacred Heart Hospital, Seoul, Korea.
4. Division of Vascular and Transplant Surgery, Department of Surgery, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea.
5. Department of Statistics and Actuarial Science, Soongsil University, Seoul, Korea.