PLoS One PLoS One Diagnostic Accuracy of the Enhanced Liver Fibrosis (ELF\u00ae) Score Using HCV-Infected Serum Samples Cryopreserved for up to 25 Years Puigvehí Marc Hernández Juanjo Broquetas Teresa Coll Susanna Garcia-Retortillo Montserrat Cañete Nuria Giménez Maria Dolors Garcia Mar Bory Felipe Salvadó Margarita Sola Ricard Carrión José A. Strnad Pavel 2016 research-article