1. Weber, Madrid, Spain. maria.merino@weber.org.es
2. Health & Territory Research (HTR), Universidad de Sevilla, Spain.
3. Weber, Madrid, Spain.
4. Universidad de Castilla-La Mancha, Toledo, and Fundación Weber, Madrid, Spain.
5. Health & Territory Research (HTR), Universidad de Sevilla, and Spanish Federation of Spondyloarthritis Associations (CEADE), Fuenlabrada, Spain.
6. Rheumatology Department, University Hospital Parc Taulí, 13PT Research Institute (UAB), Sabadell, Barcelona; Medicine Department (UAB), Barcelona, Spain.