1. Department of Pathology; VU University Medical Center, Amsterdam, The Netherlands
2. Department of Epidemiology and Biostatistics; VU University Medical Center; Amsterdam The Netherlands
3. Department of Obstetrics and Gynecology; VU University Medical Center; Amsterdam The Netherlands
4. Department of Obstetrics and Gynecology; Flevo Hospital; Almere The Netherlands
5. Department of Pathology; Erasmus Medical Center; Rotterdam The Netherlands
6. Department of Obstetrics and Gynecology; Erasmus MC University Medical Center; Rotterdam The Netherlands
7. Department of Obstetrics and Gynecology; University Medical Center Utrecht; Utrecht The Netherlands
8. Department of Gynecology; Roosevelt Clinic; Leiden The Netherlands
9. Department of Obstetrics and Gynecology; Sint Antonius Hospital; Nieuwegein The Netherlands
10. DDL Diagnostic Laboratory; Rijswijk The Netherlands