Harrold LR, Litman HJ, Connolly SE, Kelly S, Hua W, Alemao E, Rosenblatt L, Rebello S, Kremer JM. A window of opportunity for abatacept in RA: is disease duration an independent predictor of low disease activity/remission in clinical practice? Clin Rheumatol. 2017 Jun; 36(6):1215-1220.