Environmental influences on familial resemblance for drug abuse in first-cousin pairs: a Swedish national study.

Abstract excerpt

BACKGROUND: Using three independent methods, prior studies in Swedish sibling pairs indicate that environmental factors contribute substantially to familial aggregation for drug abuse (DA). Could we replicate these results in cousin pairs? METHOD: Using multiple Swedish public databases (1964-2011), we defined DA using medical, legal or pharmacy registry records and examined concordance in full cousin pairs as a...

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