[1] Univ Med Ctr, Dept Obstet & Gynaecol, Erasmus MC, NL-3015 GD Rotterdam, Netherlands
[2] Leiden Univ Med Ctr, Dept Pathol, NL-2333 ZA Leiden, Netherlands
[3] Univ Med Ctr Utrecht, Dept Pathol, NL-3584 CX Utrecht, Netherlands
[4] Univ Med Ctr, Dept Pathol, Erasmus MC, NL-3015 GD Rotterdam, Netherlands
[5] Univ Med Ctr, Dept Virosci, Erasmus MC, NL-3015 GD Rotterdam, Netherlands
[6] Erasmus MC, Dept Pediat Infectiol Immunol & Rheumatol, NL-3015 GD Rotterdam, Netherlands
[7] Ikazia Hosp, Dept Obstet & Gynaecol, NL-3083 AN Rotterdam, Netherlands
[8] Franciscus Vlietland Hosp, Dept Obstet & Gynaecol, NL-3045 PM Rotterdam, Netherlands
[9] Leiden Univ Med Ctr, Dept Obstet & Gynaecol, NL-2333 ZA Leiden, Netherlands
[10] Univ Med Ctr, Dept Neonatol, Erasmus MC, NL-3015 GD Rotterdam, Netherlands