1. Department of Obstetrics and Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands;
2. Department of Obstetrics and Gynaecology, Amphia Hospital, Breda, The Netherlands;
3. Department of Medical Psychology, Radboud University Medical Center, Nijmegen, The Netherlands;
4. Department of Medical Microbiology, Radboud University Medical Center, Nijmegen, The Netherlands