[1] Univ Med Ctr Rotterdam, Erasmus MC, Dept Obstet & Gynaecol, Div Obstet & Prenatal Med, NL-3000 CA Rotterdam, Netherlands
[2] Univ Med Ctr Rotterdam, Erasmus MC, Dept Clin Genet, NL-3000 CA Rotterdam, Netherlands
[3] Univ Med Ctr Rotterdam, Erasmus MC, Dept Epidemiol & Biostat, NL-3000 CA Rotterdam, Netherlands