1. Department of Preventive Medicine; Gachon University of Medicine and Science; Incheon; Korea
2. Molecular Epidemiology Branch, Research Institute; National Cancer Center; Goyang; Korea
3. Department of Preventive medicine; Hanyang University College of Medicine; Seoul; Korea
4. Department of Internal Medicine; Hanyang University College of Medicine; Seoul; Korea
5. Department of Pathology; Chungnam National University College of Medicine; Daejeon; Korea
6. Medical Genomics Research Center; Korea Research Institute of Bioscience and Biotechnology; Daejeon; Korea
7. Department of Preventive Medicine; Konkuk University; Chungju; Korea
8. Department of Preventive Medicine; Seoul National University College of Medicine; Seoul; Korea