SDF4 and rheumatoid arthritis: Supplementary Table S3 shows that the trans‐pQTLs contributing to this GATE score include 12 regions containing genes previously associated with rheumatoid arthritis through GWAS studies: SDF4, AP4B1, PTPN22, CTLA4, BACH2, TRAF1, IL2RA, TSPAN14, PTPN11, ILF3, FUT2 and AIRE.