Frequency of biologic switching and the outcomes of switching in children and young people with juvenile idiopathic arthritis: a national cohort study

Lianne Kearsley-Fleet, Eleanor Heaf, Rebecca Davies, Eileen Baildam, Michael W. Beresford, Helen E. Foster, Taunton Southwood, Wendy Thomson, Kimme Hyrich, Biologics for Children with Rheumatic Diseases Study (BCRD), British Society for Paediatric and Adolescent Rheumatology Etanercept Cohort Study (BSPAR-ETN)