Interval prolongation of etanercept in rheumatoid arthritis, ankylosing spondylitis, and psoriatic arthritis: a randomized controlled trial. - Ruwaard, J; L' Ami, MJ; Kneepkens, EL; Krieckaert, CLM; Nurmohamed, MT; Hooijberg, F; van Kuijk, AWR; van Denderen, JC; Burgemeister, L; Rispens, T; Boers, M; Wolbink, GJ (Scandinavian Journal of Rheumatology, 2023)