1. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Dongguk University College of Medicine, Ilsan, Korea.
3. Division of Epidemiology and Health Index, Center for Genome Science, Korea Center for Disease Control and Prevention, Seoul, Korea.
4. Department of Preventive Medicine, Konkuk University School of Medicine, Chungju, Korea.
5. Department of Clinical Pharmacology, Kyunghee University School of Medicine, Seoul, Korea.
6. Seoul National University Cancer Research Institute, Seoul, Korea.