TY - STAND AU - S. Crossfield AU - H. Marzo-Ortega AU - S. Kingsbury AU - M. Pujades-Rodriguez AU - P. Conaghan BT - RMD Open DO - 10.1136/rmdopen-2021-001888 M1 - 3 PY - 2021 T2 - RMD Open TI - Changes in ankylosing spondylitis incidence, prevalence and time to diagnosis over two decades VL - 7 SN - 2056-5933 ER -