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The cognitive cost of being a twin: evidence from comparisons within families in the Aberdeen children of the 1950s cohort study

BMJ 2005; doi: https://doi.org/10.1136/bmj.38633.594387.3A (Published 29 November 2005) Cite this as: BMJ 2005;:bmj;bmj.38633.594387.3Av2

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