1. Department of Preventive Medicine; Seoul National University College of Medicine; Seoul Korea
2. Institute of Environmental Medicine; Seoul National University Medical Research Centre; Seoul Korea
3. Department of Biomedical Sciences; Seoul National University Graduate School; Seoul Korea
4. Department of Preventive Medicine; Kangwon National University; Kangwon-do Korea
5. Cancer Research Institute; Seoul National University; Seoul Korea
6. Department of Policy and Development; Seoul National University Hospital; Seoul Korea
7. Department of Family Medicine; Seoul National University Hospital; Seoul Korea