Chunk #32 — METHODS — Samples, quality control and imputation. — iPSYCH.

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Genome-wide analyses of ADHD identify 27 risk loci, refine the genetic architecture and implicate several cognitive domains.

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Detailed information on genotyping, imputation and quality control can be found in the Supplementary Note. After QC, the iPSYCH1 ADHD sample included 38,899 individuals and iPSYCH2 included 24,144 individuals.