The affiliations for the fourth and sixth authors were incorrect. Lauren J. Lahey and Piyanka E. Chandra are not affiliated with 1 and 2, but 1 and 4. There was an error in the legend for Figure 3. The correct legend for Figure 3 is: Multiple logistic regression was performed to identify markers from the reduced set of 21 antibodies and 38 cytokines which could classify pre-clinical RA subjects as being within 2 years of the onset of clinical RA. 5-fold cross validation was performed and common markers selected for final validation. A, Demonstrated is a receiver operating characteristic (ROC) curve using the panel of markers listed in figure 3a and b. B-C, Mean and standard deviation of values for each individual autoantibody (B) or cytokine (C) contributing to prediction of imminent onset RA as measured among controls, those RA patients at a timepoint greater than 2 years prior to RA onset, or those within 2 years of clinical RA onset.