Temporal changes in incidence and prevalence of intellectual disability between two birth cohorts in Northern Finland

Heikura U, Taanila A, Olsen P, Hartikainen A-L, von Wendt L, Järvelin M-R. Temporal changes in incidence and prevalence of intellectual disability between two birth cohorts in Northern Finland. Am J Ment Retard. 2003; 108(1): 19-31.