1. Department of Surgery, Daejeon St. Mary's Hospital, The Catholic University of Korea College of Medicine, Daejeon, Korea.
2. Department of Pathology, Daejeon St. Mary's Hospital, The Catholic University of Korea College of Medicine, Daejeon, Korea.
3. Department of Anesthesiology, Daejeon St. Mary's Hospital, The Catholic University of Korea College of Medicine, Daejeon, Korea.