1. Department of Trauma and Vascular Surgery, The Catholic University of Korea, Uijeongbu St. Mary's Hospital, Uijeongbu, Korea.
2. Biostatistics Collaboration Unit, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.