National quality control and validation of hepatitis C NS3, NS5A and NS5B genotypic resistance testing. Issue 1 (February 2018) - Ruggiero, T.; Cento, V.; Aragri, M.; Arosio, M.; Baldanti, F.; Brunetto, M.; Bruzzone, B.; Boeri, E.; Cavallone, D.; Coppola, N.; Di Stefano, M.; Ghisetti, V.; et al.