[1] Aarhus Univ Hosp, Dept Gynaecol & Obstet, 99 Palle Juul Jensens Blvd, DK-8200 Aarhus, Denmark
[2] Aarhus Univ, Dept Clin Med, Aarhus, Denmark
[3] Univ Southern Denmark, Inst Publ Hlth, Res Unit Gen Practice, Odense, Denmark
[4] Univ Southern Denmark, Dept Clin Res, Odense, Denmark
[5] Odense Univ Hosp, Odense, Denmark
[6] Odense Univ Hosp, Dept Gynaecol & Obstet, Odense, Denmark