Chunk #3 — Materials and Methods — Measures — Genotyping.

Source

Sibling comparisons elucidate the associations between educational attainment polygenic scores and alcohol, nicotine and cannabis.

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Genotyping for the COGA European ancestry participants was performed using the Illumina 1M, Illumina OmniExpress (Illumina, San Diego, CA), and Smokescreen (BioRealm, Walnut, CA) arrays. Quality control and imputation procedures are described in Lai et al. [31] and in the Supporting Information section 1.