1. Department of Public Health Sciences and Institute of Health and Environment, Seoul National University, Seoul, Korea.
2. Department of Surgery, Dongnam Institute of Radiological and Medical Sciences, Busan, Korea.
3. Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul, Korea.
4. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Surgery, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea.
6. Department of Surgery, Chung-Ang University College of Medicine, Seoul, Korea.