1. From The Generation R Study Group (E.H.v.d.H., V.W.V.J.) and Departments of Epidemiology (E.H.v.d.H., A.H., V.W.V.J.), Public Health (J.P.M.), Obstetrics and Gynaecology (E.A.P.S.), and Paediatrics (V.W.V.J.), Erasmus Medical Center, Rotterdam, The Netherlands; TNO Urban Environment (E.H.v.d.H., Y.d.K., F.H.P., H.M.E.M.), Delft, The Netherlands; TNO Urban Environment (S.W.v.R., P.Y.J.Z.), Utrecht, The Netherlands.