PRTN3 and rheumatoid arthritis: Any potential influence from individual clinical characteristics (presence of subcutaneous rheumatoid nodules; RF+ and/or ACPA+; disease duration; age at baseline) and/or concomitant therapies (prednisone use; any of methotrexate, leflunomide, salazopyrin and/or hydroxychloroquine) was considered in an expanded multivariable logistic regression model.