1. Department of Internal Medicine, GangNeung Asan Hospital, University of Ulsan College of Medicine, GangNeung, Korea.
2. Department of General Surgery, GangNeung Asan Hospital, University of Ulsan College of Medicine, GangNeung, Korea.
3. Department of Patholgy, GangNeung Asan Hospital, University of Ulsan College of Medicine, GangNeung, Korea.