McGue et al. (2013) performed an AD GWAS of “behavioral disinhibition” traits including AD and alcohol consumption in a twin and adoptive family sample of 7,188 EA subjects clustered in 2,300 nuclear families from the Minnesota Center for Twin and Family Research (MCTFR). The authors tested for association between an AD factor score and over 500,000 SNPs, but found no GWS associations with AD.