Multiclass HCV resistance to interferon-free direct acting antivirals regimens in real life failures advocates for tailored second-line therapies. Issue 1 (16th February 2017) - Di Maio, V.C.; Cento, V.; Lenci, I.; Aragri, M.; Barbaliscia, S.; Francioso, S.; Paolucci, S.; Melis, M.; Verucchi, G.; Masetti, C.; Coppola, N.; Magni, C.F.; et al.