[1] Univ Amsterdam, Acad Med Ctr, Dept Obstet & Gynecol, NL-1105 AZ Amsterdam, Netherlands
[2] Groene Hart Hosp, Dept Obstet & Gynecol, Gouda, Netherlands
[3] Univ Groningen, Univ Med Ctr Groningen, Dept Obstet & Gynecol, NL-9713 AV Groningen, Netherlands
[4] Ikazia Hosp, Dept Obstet & Gynecol, Rotterdam, Netherlands
[5] Haga Hosp, Dept Obstet & Gynecol, The Hague, Netherlands
[6] Meander Med Ctr, Dept Obstet & Gynecol, Amersfoort, Netherlands
[7] Diakonessen Hosp, Dept Obstet & Gynecol, Utrecht, Netherlands
[8] Amphia Hosp, Dept Obstet & Gynecol, Breda, Netherlands
[9] Med Ctr Leeuwarden, Dept Obstet & Gynecol, Leeuwarden, Netherlands
[10] Maxima Med Ctr, Dept Obstet & Gynecol, Veldhoven, Netherlands
[11] Jeroen Bosch Hosp, Dept Obstet & Gynecol, Den Bosch, Netherlands
[12] Maastricht Univ Med Ctr, Dept Obstet & Gynecol, Maastricht, Netherlands
[13] Radboud Univ Nijmegen Med Ctr, Dept Obstet & Gynecol, Nijmegen, Netherlands
[14] Univ Groningen, Univ Med Ctr Groningen, Dept Obstet & Gynecol, NL-9713 AV Groningen, Netherlands
[15] Ikazia Hosp, Dept Obstet & Gynecol, Rotterdam, Netherlands
[16] Leiden Univ, Med Ctr, Dept Obstet & Gynecol, Leiden, Netherlands