Analysis of the correlation between disease activity score 28 and its ultrasonographic equivalent in rheumatoid arthritis patients - Roxana Coras; Gustavo Añez Sturchio; Mireia Barceló Bru; Agustí Sellas Fernandez; Sandra Farietta; Salvador Campos Badia; Basilio Rodríguez Diez; Juan José de Agustín de Oro (European Journal of Rheumatology, 2020)