1. [1] Lipsky PE. Harrison's principles of internal medicine. Vol. 2. 20th edn. McGraw-Hill 2018: p. 1928-37.
2. [2] Kasper DL, Braunwald E. Rheumatoid Arthritis. Harrison's principles of internal medicine. Vol. 2. 20th edn. McGraw-Hill 2018: p. 1968.
3. [3] Firestein GS. Etiology and pathogenesis of rheumatoid arthritis. In: Ruddy S, Harris E, Sledge C, eds. Kelly's textbook of rheumatology. 6th edn. Philadelphia: WB Saunders 2001: p. 921-66.
4. Making an impact on mortality in rheumatoid arthritis: targeting cardiovascular comorbidity;Boers;Arthritis Rheum,2004
5. Chronic pulmonary toxicity of methotrexate and rheumatoid arthritis;Provenzano;Rheumotology (Oxford),2003