Chunk #23 — Materials and Methods — SNP Genotyping and Quality Control

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Haplotypes with copy number and single nucleotide polymorphisms in CYP2A6 locus are associated with smoking quantity in a Japanese population.

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We used genotyping data collected using the Illumina OmniExpress II Genotyping BeadChip (Illumina, CA, USA) for the replication study set, which covered 16 diseases (Table S1). We applied the same quality control criteria and imputation procedure as for the GWAS data.