1. Department of Internal Medicine, College of Medicine; Chungbuk National University; Cheongju Korea
2. Medical Research Institute; College of Medicine, Chungbuk National University; Cheongju Korea
3. Department of Internal Medicine, Seoul National University College of Medicine and Cardiovascular Research Laboratory; Clinical Research Institute, Seoul National University Hospital; Seoul Korea
4. Department of Clinical Pathology; College of Medicine, Chungbuk National University; Cheongju Korea