1. Department of Obstetrics and Gynaecology; Màxima Medical Centre; Veldhoven the Netherlands
2. Department of Obstetrics and Gynaecology; Elisabeth-TweeSteden Hospital; Tilburg the Netherlands
3. Department of Obstetrics and Gynaecology; Bravis hospital, Bergen op Zoom & Roosendaal; the Netherlands
4. Department of Obstetrics and Gynaecology; Medisch Spectrum Twente; Enschede the Netherlands