Affiliation: | 1. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea;2. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea;3. Department of Family Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea;4. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea |