Solomon DH, Lee SB, Zak A, Corrigan C, Agosti J, Bitton A, Harrold L, Losina E, Lu B, Pincus T, Radner H, Smolen J, Katz JN, Fraenkel L. Implementation of treat-to-target in rheumatoid arthritis through a Learning Collaborative: Rationale and design of the TRACTION trial. Semin Arthritis Rheum. 2016 08; 46(1):81-7.