Jacqueline Uson1, Sebastián Cruz Rodriguez-García2, Raul Castellanos-Moreira3, Terence W O'Neill4, Michael Doherty5, Mikael Boesen6, Hemant Pandit7, Ingrid Möller Parera8, Valentina Vardanyan9, Lene Terslev10, Willm Uwe Kampen11, Maria-Antonietta D'Agostino12, Francis Berenbaum13, Elena Nikiphorou14, Irene A Pitsillidou15, Jenny de la Torre-Aboki16, Loreto Carmona17, Esperanza Naredo18. 1. Rheumatology Deptarment, Hospital Universitario Móstoles, Universidad Rey Juan Carlos, Madrid, Spain jusonjaeger@gmail.com. 2. Rheumatology Department, Hospital Universitario de la Princesa, Madrid, Spain. 3. Rheumatology Department, Centre Sociosanitari Hospital Clínic i Provincial de Barcelona, Barcelona, Spain. 4. Arthritis Research UK Centre for Epidemiology, The University of Manchester, Manchester, UK. 5. Acaedemic Rheumatology, University of Nottingham, Nottingham, UK. 6. Musculoskeletal research Unit, Department of Radiology, Copenhagen University Hospital Bispebjerg and Frederiksberg, Copenhagen, Denmark. 7. Orthopaedic Surgery, Chapel Allerton Hospital, University of Leeds, Leeds, UK. 8. Reumatology Deptarment, Instituto Poal, Barcelona, Spain. 9. Rheumatology Department, Yerevan State Medical University Named after Mkhitar Heratsi, Yerevan, Armenia. 10. Center for Rheumatology and Spine Diseases, Rigshospitalet, Copenhagen, Denmark. 11. Nuclear Medicine Spitalerhof, Radiologische Allianz, Hamburg, Germany. 12. Rheumatology Department, Università Cattolica del Sacro Cuore, Policlinico Universitario Agostino Gemelli IRCSS, Rome, Italy. 13. Rheumatology Department, Sorbonne Université, Paris, France. 14. Rheumatology Research, Acaedemic Department of Rheumatology, King's College London, London, UK. 15. EULAR Patient Research Partner, Cyprus League Against Rheumatism, Nicosia, Cyprus. 16. Rheumatology Day Hospital, Hospital General Universitario de Alicante, Alicante, Spain. 17. Instituto de Salud Musculoesquelética (INMUSC), Madrid, Spain. 18. Rheumatology Department and Joint and Bone Research Unit, Hospital Universitario Fundación Jiménez Díaz, Madrid, Spain.