1. Department of Internal Medicine, School of Medicine and Institute of Medical Science, Jeju National University, Gwangju, Korea.
2. Department of Surgery, School of Medicine and Institute of Medical Science, Jeju National University, Gwangju, Korea.
3. Department of Pathology, School of Medicine and Institute of Medical Science, Jeju National University, Gwangju, Korea.
4. Department of Pathology, Chonnam National University Medical School and Research Institute of Medical Sciences, Gwangju, Korea.