| Affiliation: | (1) Department of Family Medicine, School of Medicine, Inha University, Incheon, Republic of Korea;(2) Cancer Epidemiology Branch, Research Institute, Smoking Cessation Clinic, Family Medicine Clinic, and Center for Cancer Prevention and Detection, Hospital, National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang, Gyeonggi-do, 410-769, Republic of Korea;(3) Health Promotion Center, Department of Family Medicine, Seoul National University Hospital, Seoul, Republic of Korea;(4) Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea;(5) Department of Obstetrics and Gynecology, School of Medicine, Ewha Womans University, Seoul, Republic of Korea; |
