1. Hospital el Bierzo, Gerencia de Asistencia Sanitaria del Bierzo, SACYL, IBSAL, RETICEF; Internal Medicine Department; c/Medicos Sin fronteras, 7 Ponferrada Leon Spain 24411
2. Western General Hospital; Rheumatic Diseases Unit; Edinburgh UK EH4 2XU
3. University of Salamanca, University Hospital of Salamanca, IBSAL, RETICEF; Department of Medicine, Service of Rheumatology; Paseo San Vicente 54 Salamanca Salamanca Spain 37007
4. University of Edinburgh; Centre for Genomic and Experimental Medicine; Western General Hospital Edinburgh UK EH4 2XU