1. Department of Family Medicine Chungnam National University Hospital Daejeon Republic of Korea
2. Public Health and Medical Services Office, Chungnam National University Hospital Daejeon Republic of Korea
3. Department of Preventive Medicine School of Medicine, Chungnam National University Daejeon Republic of Korea
4. Department of Internal Medicine School of Medicine, Chungnam National University Daejeon Republic of Korea
5. Department of Public Health Sciences Graduate School of Public Health, Seoul National University Seoul Republic of Korea
6. Clinical Trials Center, Statistics Office Biomedical Research Institute, Chungnam National University Hospital Daejeon Republic of Korea