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The author's plenary address at the 3rd International Association for the Scientific Study of Intellectual Disabilities‐Europe Conference in Rome, Italy (October 2010), provided a retrospective overview of a longitudinal study conducted with a cohort of pre‐teens (11 and 13 years of age) residing in Warsaw, Poland, in the 1970s. The intent was to examine, over an extended period of years, the relationship...
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