"Design characteristics of the CORRONA CERTAIN study: a comparative effectiveness study of biologic agents for rheumatoid arthritis patients".
Pappas DA, Kremer JM, Reed G, Greenberg JD, Curtis JR. "Design characteristics of the CORRONA CERTAIN study: a comparative effectiveness study of biologic agents for rheumatoid arthritis patients". BMC Musculoskelet Disord. 2014 Apr 01; 15:113.