Funovits J, Aletaha D, Bykerk V, Combe B, Dougados M, Emery P, Felson D, Hawker G, Hazes JM, Huizinga T, Kay J, Kvien TK, Smolen JS, Symmons D, Tak PP, Silman A. The 2010 American College of Rheumatology/European League Against Rheumatism classification criteria for rheumatoid arthritis: methodological report phase I. Ann Rheum Dis. 2010 Sep; 69(9):1589-95.