Maternal thyroid function during early pregnancy and cognitive functioning in early childhood: The generation R study - Henrichs, J; Bongers-Schokking, J J; Schenk, J J; Ghassabian, A; Schmidt, H G; Visser, T J; Hooijkaas, H; de Muinck Keizer-Schrama, S M; Hofman, A; Jaddoe, V V; Visser, W; Steegers, E A; Verhulst, F C; de Rijke, Y B; Tiemeier, H (J Clin Endocrinol Metab, 2010)