[1] Maastricht Univ, Med Ctr, Dept Obstet & Gynaecol, GROW Sch Oncol & Dev Biol, NL-6202 AZ Maastricht, Netherlands
[2] Maastricht Univ, Med Ctr, Dept Clin Epidemiol & Med Technol Assessment KEMT, NL-6202 AZ Maastricht, Netherlands
[3] Univ Med Hosp Utrecht, Dept Obstet & Gynaecol, NL-3508 AB Utrecht, Netherlands
[4] Maastricht Univ, Med Ctr, Caphri Sch Publ Hlth & Primary Care, Dept Epidemiol, NL-6202 AZ Maastricht, Netherlands
[5] Univ Groningen, Univ Med Ctr Groningen, Dept Obstet & Gynaecol, NL-9700 RB Groningen, Netherlands
[6] Ruwaard van Putten Hosp, Dept Obstet & Gynaecol, NL-3200 GA Spijkenisse, Netherlands
[7] Radboud Univ Nijmegen, Dept Obstet & Gynaecol, NL-6500 HB Nijmegen, Netherlands
[8] Univ Amsterdam, Acad Med Ctr, Dept Obstet & Gynaecol, NL-1100 DD Amsterdam, Netherlands
[9] Zaans Med Ctr, Dept Obstet & Gynaecol, NL-1500 EE Zaandam, Netherlands
[10] Tergooi Hosp Blaricum, Dept Obstet & Gynaecol, NL-1201 DA Hilversum, Netherlands
[11] Gelre Hosp, Dept Obstet & Gynaecol, NL-7300 DS Apeldoorn, Netherlands
[12] Maxima Med Ctr, Dept Obstet & Gynaecol, NL-5500 MB Veldhoven, Netherlands
[13] Elkerliek Hosp, Dept Obstet & Gynaecol, NL-5700 AB Helmond, Netherlands
[14] Catharina Hosp, Dept Obstet & Gynaecol, NL-5602 ZA Eindhoven, Netherlands
[15] Orbis Med Ctr, Dept Obstet & Gynaecol, NL-6130 MB Sittard, Netherlands
[16] St Jans Hosp Weert, Dept Obstet & Gynaecol, NL-6000 AA Weert, Netherlands
[17] Atrium Med Ctr Parkstad, Dept Obstet & Gynaecol, NL-6401 CX Heerlen, Netherlands
[18] Ijsselland Hosp, Dept Obstet & Gynaecol, NL-2900 AR Capelle aan den IJssel, Netherlands
[19] Flevohospital, Dept Obstet & Gynaecol, NL-1300 EG Almere, Netherlands
[20] Meander Med Ctr, Dept Obstet & Gynaecol, NL-3800 BM Amersfoort, Netherlands
[21] Hosp Rijnstate, Dept Obstet & Gynaecol, NL-6800 TA Arnhem, Netherlands
[22] ZG Twente, Dept Obstet & Gynaecol, NL-7600 SZ Almelo, Netherlands
[23] Radboud Univ Nijmegen, Med Ctr, Sci Inst Qual Healthcare IQ Healthcare, NL-6500 HB Nijmegen, Netherlands