[1] Roskilde Cty Hosp, Dept Gynecol & Obstet, Roskilde, Denmark
[2] Hvidovre Univ Hosp, Dept Obstet & Gynecol, Hvidovre, Denmark
[3] Rigshosp, Dept Obstet & Gynecol, Copenhagen, Denmark
[4] Rigshosp, Ctr Clin Intervent Res, Copenhagen Trial Unit, Copenhagen, Denmark
[5] Slagelse Cty Hosp, Dept Obstet & Gynecol, Slagelse, Denmark
[6] Hillerod Cty Hosp, Dept Obstet & Gynecol, Hillerod, Denmark
[7] Glostrup Cty Hosp, Dept Obstet & Gynecol, Glostrup, Denmark
[8] Gentofte Cty Hosp, Dept Obstet & Gynecol, Gentofte, Denmark
[9] Herlev Cty Hosp, Dept Obstet & Gynecol, Herlev, Denmark
[10] Holstebro Cty Hosp, Dept Obstet & Gynecol, Holstebro, Denmark