1. Hospital de Elda; Servicio de Reumatologia; Ctra. Elda-Sax, PTDA. La Torreta, S/N Elda (Alicante) Spain 03600
2. Repatriation General Hospital; Rheumatology Unit; Daws Road Daw Park South Australia Australia 5041
3. Hospital General Universitario de Alicante; Sección de Reumatología; C/ Pintor Baeza, 12 Alicante Spain 03010
4. Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University; Monash Department of Clinical Epidemiology, Cabrini Hospital; Suite 41, Cabrini Medical Centre 183 Wattletree Road Malvern Victoria Australia 3144
5. Instituto de Salud Musculoesquelética; Calle Ofelia Nieto, 10 Madrid Spain 28039