[1] Reinier de Graaf Grp, Dept Obstet & Gynecol, NL-2600 GA Delft, Netherlands
[2] Erasmus MC Univ, Med Ctr, Josephine Nefkens Inst, Dept Pathol, Rotterdam, Netherlands
[3] Erasmus MC Univ, Med Ctr, Dept Epidemiol & Biostat, Rotterdam, Netherlands
[4] Erasmus MC Univ, Med Ctr, Dept Obstet & Gynecol, Rotterdam, Netherlands