1. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea.
3. Department of Surgery and Cancer Research Institute, Gastric Cancer Center, Seoul National University Cancer Hospital, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Surgery, Gastric Cancer Center, Seoul National University Cancer Hospital, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Nursing, Seoul National University Hospital, Seoul, Korea.