1. Department of Obstetrics and Gynaecology; Erasmus University Medical Centre; Rotterdam the Netherlands
2. Department of Biostatistics; Erasmus University Medical Centre; Rotterdam the Netherlands
3. Department of Clinical Chemistry; Erasmus University Medical Centre; Rotterdam the Netherlands
4. Department of Bioinformatics; Erasmus University Medical Centre; Rotterdam the Netherlands
5. Department of Clinical Genetics; Erasmus University Medical Centre; Rotterdam the Netherlands