1. Department of Biomedical Sciences, Seoul National University Graduate School, Seoul, Korea.
2. Department of Family Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
3. JW Lee Center for Global Medicine, Seoul, Korea.
4. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Environmental Medicine, Seoul National University Medical Research Center, Seoul, Korea.