1. Department of Epidemiology, School of Public Health; Seoul National University; Seoul South Korea
2. Institute of Health Environment; Seoul National University; Seoul South Korea
3. Department of Family Medicine, Busan Paik Hospital, College of Medicine; Inje University; Busan South Korea
4. Department of Family Medicine, Samsung Medical Center and Center for Clinical Research, Samsung Biomedical Research Institute, School of Medicine; Sungkyunkwan University; Seoul South Korea