1. Sección de Reumatología; Hospital General Universitario de Alicante; Alicante Spain
2. Departamento de Medicina Clínica; Universidad Miguel Hernández; Elche Spain
3. Servicio de Reumatologia; Hospital de Elda; Elda (Alicante) Spain
4. Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University; Monash-Cabrini Department of Musculoskeletal Health and Clinical Epidemiology; Cabrini Health; Melbourne Australia
5. Ottawa Hospital Research Institute, The Ottawa Hospital - General Campus; Ottawa Canada
6. Instituto de Salud Musculoesquelética; Madrid Spain