Chunk #9 — MATERIALS AND METHODS — Collaborative Study on the Genetics of Alcoholism — Measures:

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Genome-wide association studies of alcohol dependence, DSM-IV criterion count and individual criteria.

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To avoid the inclusion of individuals with high genetic risk who do not drink for personal, social or cultural reasons, only individuals who reported ever drinking at least one full drink of alcohol in their lifetime were included in analyses (EA: N=7,418; AA: N=3,175).