1. Department of Internal Medicine, Gwangmyeong Sungae Hospital, Gwangmyeong, Korea.
2. Department of Surgery, Gwangmyeong Sungae Hospital, Gwangmyeong, Korea.
3. Department of Pathology, Gwangmyeong Sungae Hospital, Gwangmyeong, Korea.
4. Department of Internal Medicine, Sungae Hospital, Seoul, Korea.