Littlejohn, Geoffrey, Roberts, Lynden, Bird, Paul, de Jager, Julien, Griffiths, Hedley, Nicholls, Dave, Young, Jennifer, Zochling, Jane, and Tymms, Kathleen E. (2015) Patients with rheumatoid arthritis in the Australian OPAL cohort show significant improvement in disease activity over 5 Years: a multicenter observational study. Journal of Rheumatology, 42 (9). pp. 1603-1609.