1. Department of Obstetrics and Gynecology; Maxima Medical Center; Veldhoven; The Netherlands
2. Clinical Research Unit; Academic Medical Center; Amsterdam; The Netherlands
3. Department of Obstetrics and Gynecology; Birmingham Women's Hospital; Edgbaston; Birmingham; UK
4. Department of Gynecological Oncology; University Medical Center; Utrecht; The Netherlands
5. Department of Obstetrics and Gynecology; Academic Medical Center; Amsterdam; The Netherlands