To test for replication, we also assessed the p-values of the PD genome-wide significant SNPs in four separate AD cohorts, namely the Genetic and Environmental Risk in Alzheimer's Disease (GERAD) sample, a cohort of AD cases and controls drawn from the population of Iceland (deCODE cohort), a small cohort of mild cognitive impairment or AD cases and controls drawn from the population of Norway (Oslo), and the Cohorts for Heart and Aging Research in Genomic Epidemiology (CHARGE) consortium. The AD GWAS summary statistic results from the GERAD consortium were obtained from 13 studies and consisted of 3,941 cases (62.7% female) and 7,848 controls (55.6 % female) with genotyped data at 529,205 SNPs (for additional details see reference 13). A total of 5571 controls from the PD IPDGC GWA were also present in the AD GERAD GWA. The AD GWAS summary statistic data drawn from the Icelandic population (deCODE) included 3,759 AD cases (65.8 % female) and 8,888 older controls (57.8% females) greater than 85 years of age (for additional details see references 14 and 15). The AD GWAS summary statistic
