[1] Universitat Autònoma de Barcelona,Department of Medicine
[2] Primary Healthcare Centre Badia del Vallès,Doctorate Program, Department of Medicine
[3] Catalan Health Institute.,Primary Healthcare Centre Sant Llàtzer
[4] Universitat Autònoma de Barcelona,Nuclear Medicine Service
[5] Sanitary Consortium of Terrassa,Primary Healthcare Centre Passeig Sant Joan
[6] Vall d'Hebrón University Hospital,Primary Healthcare Centre Granollers Centre
[7] Catalan Health Institute,Primary Healthcare Centre Montcada i Reixach
[8] Catalan Health Institute,Emergency Department
[9] Primary Healthcare Centre Can Gibert del Plà-Girona-2,Rheumatology Department
[10] Catalan Health Institute,Emergency Department
[11] Catalan Health Institute,Primary Healthcare Research Support Unit Metropolitana Nord
[12] Hospital de Sabadell,Primary Healthcare Centre Serraparera
[13] Sanitary Consortium of Parc Taulí,Botnar Research Centre, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences
[14] Universitat Autònoma de Barcelona,Internal Medicine Service, IMIM
[15] Hospital de Sabadell,Hospital del Mar. Department of Medicine
[16] Sanitary Consortium of Parc Taulí,undefined
[17] Universitat Autònoma de Barcelona,undefined
[18] Primary Healthcare Centre Corbera de Llobregat,undefined
[19] Catalan Health Institute,undefined
[20] University Hospital of Bellvitge,undefined
[21] Catalan Health Institute. University of Barcelona,undefined
[22] Catalan Health Institute-IDIAP Jordi Gol,undefined
[23] Primary Healthcare Centre Creu Alta,undefined
[24] Catalan Health Institute,undefined
[25] Primary Healthcare Centre Bon Pastor,undefined
[26] Catalan Health Institute,undefined
[27] University of Oxford,undefined
[28] Universitat Autònoma de Barcelona,undefined