[1] Radboud Univ Nijmegen, Med Ctr, Obstet & Gynaecol, Nijmegen, Netherlands
[2] Canisius Wilheirnina Hosp, Obstet & Gynaecol, Nijmegen, Netherlands
[3] Maxima Med Ctr, Obstet & Gynaecol, Veldhoven, Netherlands
[4] Kreiskrankenhaus Mechernich GmbH, Obstet & Gynaecol, Mechernich, Germany