[1] Univ Copenhagen, Rigshosp, Juliane Marie Ctr Children Women & Reprod, DK-2100 Copenhagen, Denmark
[2] Danish Inst Local & Reg Govt Res KORA, Copenhagen, Denmark
[3] Univ Copenhagen, Rigshosp, Juliane Marie Ctr Children Women & Reprod, Dept Anaesthesiol, DK-2100 Copenhagen, Denmark
[4] Univ Copenhagen, Rigshosp, Juliane Marie Ctr Children Women & Reprod, Dept Obstet, DK-2100 Copenhagen, Denmark
[5] Univ Copenhagen, Rigshosp, Juliane Marie Ctr Children Women & Reprod, Res Unit Womens & Childrens Hlth, DK-2100 Copenhagen, Denmark
[6] Maastricht Univ, Fac Hlth Med & Life Sci, Dept Educ Dev & Res, Maastricht, Netherlands