Harrold LR, Reed GW, Best J, Zlotnick S, Kremer JM. Real-world Comparative Effectiveness of Tocilizumab Monotherapy vs. Tumor Necrosis Factor Inhibitors with Methotrexate in Patients with Rheumatoid Arthritis. Rheumatol Ther. 2018 Dec; 5(2):507-523.