1. Department of Internal Medicine, Pusan National University School of Medicine, Busan 602-739, Korea
2. Medical Research Institute, Pusan National University, Busan 602-739, Korea
3. Department of Internal Medicine, Maryknoll Medical Center, Busan 600-730, Korea
4. Department of Pathology, Pusan National University School of Medicine, Busan 602-739, Korea
5. Department of Nuclear Medicine, Pusan National University School of Medicine, Busan 602-739, Korea
6. Kim Yong Ki Internal Medicine Clinic, Busan 602-011, Korea