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Estimated survival functions for months from Corrona RA registry enrollment to initiation of a first use of any RA-directed therapy, b first use of nbDMARDs or steroids, and c first use of nbDMARDs excluding steroids among patients with no history of RA-directed therapy at time of enrollment. KM Kaplan–Meier, nbDMARD non-biologic disease-modifying antirheumatic drug, RA rheumatoid arthritis
