Abatacept treatment improves health-related quality of life, pain, and sleep quality in juvenile idiopathic arthritis patients by Ruperto N, Lovell DJ, Li T, Quartier P, Chavez J, Huemer C, Kivitz A, Blanco F, Foeldvari I, Hofer M, Sigal L, Block A, Covucci A, Martini A, Giannini EH