%0 Journal article %D 2018 %T Association between methylphenidate and amphetamine use in pregnancy and risk of congenital malformations: A cohort study from the international pregnancy safety study consortium %A Huybrechts KF; Bröms G; Christensen LB; Einarsdóttir K; Engeland A; Furu K; Gissler M; Hernandez-Diaz S; Karlsson P; Karlstad Ø