1. Department of Surgery, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
2. Department of Gastroenterology & Hepatology, Hallym University Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
3. Department of Gastroenterology & Hepatology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.