1. Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.
2. Department of Surgery, Kyungpook National University Hospital, Daegu, Korea.
3. Department of Pathology, Kyungpook National University Hospital, Daegu, Korea.
4. Department of Internal Medicine, College of Medicine, Dongguk University, Gyeongju, Korea.
5. Department of Anesthesiology, Kyungpook National University Hospital, Daegu, Korea.