TY - JOUR A1 - Hansen, B.T. A1 - Kjær, S.K. A1 - Arnheim-Dahlström, L. A1 - Liaw, L.-L. A1 - Juul, K.E. A1 - Thomsen, L. T. A1 - Frederiksen, K. A1 - Elfström, K.M. A1 - Munk, C. A1 - Nygård, M. T1 - Age at first intercourse, number of partners and sexually transmitted infection prevalence among Danish, Norwegian and Swedish women: Estimates and trends from nationally representative cross‐sectional surveys of more than 100 000 women Y1 - 2020 DO - 10.1111/aogs.13732 VL - 99 IS - 2 ER -