[1] Reinier Graaf Hosp, Dept Obstet & Gynecol, NL-2600 GA Delft, Netherlands
[2] Reinier Graaf Hosp, Dept Pathol, NL-2600 GA Delft, Netherlands
[3] Erasmus MC Univ, Med Ctr, Dept Pathol, Rotterdam, Netherlands
[4] Vrije Univ Amsterdam, Med Ctr, Dept Pathol, Amsterdam, Netherlands
[5] Erasmus MC Univ, Med Ctr, Dept Obstet & Gynecol, Rotterdam, Netherlands