1. Department of Family Medicine; MyongJi Hospital; 14-55 Hwasu-ro, Deokyang-gu Goyang Gyeonggi-do 10475 Republic of Korea
2. Department of Family Medicine, School of Medicine; Yonsei University; 50-1 Yonsei-ro Seodaemoon-gu Seoul 03722 Republic of Korea
3. Department of Cancer Control and Policy, Graduate School of Cancer Science and Policy; National Cancer Center; 323 Ilsan-ro, Ilsandong-gu Goyang Gyeonggi-do 10408 Republic of Korea
4. Molecular Epidemiology Branch, Division of Cancer Epidemiology and Prevention; Research Institute, National Cancer Center; Goyang Republic of Korea
5. Department of Family Medicine and Center for Cancer Prevention and Detection; Hospital, National Cancer Center; Goyang Republic of Korea
6. Department of Family Medicine; Wonju Severance Christian Hospital; 20 Ilsan-ro Wonju Gangwon-do 220-701 Republic of Korea
7. Department of Family Medicine; Yongin Severance Hospital; 225 Gumhak-ro, Cheoin-gu Yongin Gyeonggi-do 17046 Republic of Korea