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CL Hart , MD Taylor , G Davey Smith , LJ Whalley , JM Starr , DJ Hole , V Wilson , IJ Deary (2003). Childhood IQ, social class, deprivation, and their relationships with mortality and morbidity risk in later life: prospective observational study linking the Scottish Mental Survey 1932 and the Midspan studies. Psychosomatic Medicine 65, 877–883.
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