1. Department of Surgery, The Catholic University of Korea, Uijeongbu St. Mary’s Hospital, Uijeongbu, Korea.
2. Department of Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Surgery, Dongnam Institute of Radiological and Medical Sciences, Busan, Korea.
4. Department of Surgery, Uijeongbu Eulji Medical Center, Eulji University, Uijeongbu, Korea.