[1] Copenhagen Univ Hosp, Rigshosp, Res Unit Womens & Childrens Hlth, Juliane Marie Ctr Women Children & Reprod, DK-2100 Copenhagen, Denmark
[2] Roskilde Univ Hosp, Dept Obstet & Gynaecol, Roskilde, Denmark
[3] Malmo Univ, Hlth & Soc, Dept Care Sci, Malmo, Sweden
[4] Uppsala Univ, Dept Publ Hlth & Caring Sci, Uppsala, Sweden
[5] Univ Coll Nordjylland, Knowledge Ctr Reprod Hlth & Family Forming, Aalborg, Denmark
[6] Univ Surrey, Fac Hlth & Med Sci, Guildford GU2 5XH, Surrey, England
[7] Univ Copenhagen, Fac Hlth & Med Sci, Copenhagen, Denmark