The comparative risk of serious infections among rheumatoid arthritis patients starting or switching biological agents
Jeffrey R Curtis, Fenglong Xie, Lang Chen, John W Baddley, Timothy Beukelman, Kenneth G Saag, Claire Spettell, Raechele M McMahan, Joaquim Fernandes, Kevin Winthrop, Elizabeth Delzell
Annals of the Rheumatic Diseases Aug 2011, 70 (8) 1401-1406; DOI: 10.1136/ard.2010.146365