1. Department of Family Medicine Konkuk University Medical Center, Konkuk University School of Medicine Seoul South Korea
2. Department of Family Medicine Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine Seoul South Korea
3. Center for Health Promotion Samsung Medical Center, Sungkyunkwan University School of Medicine Seoul South Korea
4. Department of Family Medicine Samsung Medical Center, Sungkyunkwan University School of Medicine Seoul South Korea