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