[1] Erasmus Univ, Generat Study Grp R, Rotterdam, Netherlands
[2] Erasmus Univ, Dept Epidemiol, Rotterdam, Netherlands
[3] Erasmus Univ, Dept Obstet & Gynaecol, Rotterdam, Netherlands
[4] Erasmus Univ, Dept Pediat, Rotterdam, Netherlands
[5] Erasmus Univ, Dept Pediat Resp Med, Rotterdam, Netherlands
[6] Erasmus Univ, Dept Pediat Neonatol, Rotterdam, Netherlands