1. Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
2. Department of Pathology, Kyungpook National University School of Medicine, Daegu, Korea.
3. Department of Surgery, Kyungpook National University School of Medicine, Daegu, Korea.
4. Department of Clinical Pathology, Kyungpook National University School of Medicine, Daegu, Korea.