1. Department of Obstetrics and Gynaecology; Radboud University Medical Center; Nijmegen HB 6500 The Netherlands
2. Department of Obstetrics and Gynaecology; Jeroen Bosch Hospital; ‘s-Hertogenbosch ME 5200 The Netherlands
3. Institute for Health Sciences, Radboud University Medical Center; Nijmegen HB 6500 The Netherlands
4. Department of Pathology; VU University Medical Center; Amsterdam MB 1007 The Netherlands
5. Department of Pathology; Erasmus MC, University Medical Center; Rotterdam CA 3000 The Netherlands
6. Department of Pathology; Radboud University Medical Center; Nijmegen HB 6500 The Netherlands
7. Department of Medical Microbiology; Radboud University Medical Center; Nijmegen HB 6500 The Netherlands