1. Department of Biomedical Engineering, Kyung Hee University School of Medicine, Seoul 130-701, Korea.
2. Division of Epidemiology and Health Index, Center for Genome Science, Korea National Institute of Health, Korea Centers for Disease Control and Prevention, Cheongwon 363-951, Korea.
3. Department of Medical Genetics, Ajou University School of Medicine, Suwon 443-721, Korea.