[1] Aarhus Univ, Dept Clin Med, Aarhus, Denmark
[2] Aarhus Univ Hosp, Dept Obstet & Gynecol, Aarhus, Denmark
[3] Aarhus Univ Hosp, MR Ctr, Aarhus, Denmark
[4] Herlev & Gentofte Univ Hosp, Dept Obstet & Gynecol, Herlev, Denmark
[5] Univ Copenhagen, Inst Clin Med, Copenhagen, Denmark