Of the 47,294 probes for which we collected expression data, we initially selected a set of 14,925 probes to analyze as described in Stranger et al. 19. We subsequently discarded from our analyses any probe that mapped to more than one Ensembl gene (Ensembl version 42) or that had an associated SNP underlying the probe sequence. This resulted in a set of 14,456 probes that were analyzed in the association analyses, corresponding to 13,643 unique autosomal genes.