Smoking during pregnancy and hyperactivity-inattention in the offspring--comparing results from three Nordic cohorts

C Obel, K. M Linnet, T. B Henriksen, A Rodriguez, M. R Jarvelin, A Kotimaa, I Moilanen, H Ebeling, N Bilenberg, A Taanila, G Ye and J. Olsen

International Journal of Epidemiology 38 ( 3 ): 698 - 705 , 2009