KIR2DP1 and rheumatoid arthritis: The pseudo genes KIR2DP1 (P = 0.01, OR (95%CI) = 4.16 (1.37–12.65)) and KIR3DP1-004 (P = 0.01, OR(95%CI) = 3.78(1.38–10.36)) were the most important risk estimators of RA.