Measuring Spinal Mobility Using an Inertial Measurement Unit System: A Validation Study in Axial Spondyloarthritis oleh I. Concepción Aranda-Valera, Antonio Cuesta-Vargas, Juan L. Garrido-Castro, Philip V. Gardiner, Clementina López-Medina, Pedro M. Machado, Joan Condell, James Connolly, Jonathan M. Williams, Karla Muñoz-Esquivel, Tom O’Dwyer, M. Carmen Castro-Villegas, Cristina González-Navas, Eduardo Collantes-Estévez, on behalf of iMaxSpA Study Group