Additional file 1.

Supplemental Table 1 presenting participant demographic and clinical details, Supplemental Table 2 presenting genomic control SNPs, and Supplemental Figure 1 showing the correlation of self-reported number of EP grandparents with estimated EP ancestry using 67 genomic control markers.

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Hollis-Moffatt et al. Arthritis Research & Therapy 2012 14:R92   doi:10.1186/ar3816