Increased plasma concentration of ribavirin as a result of renal dysfunction in hepatitis C virus patients treated with telaprevir. Issue 3 (28th July 2014) - Tempestilli, Massimo; Lionetti, Raffaella; D'Offizi, Gianpiero; Montalbano, Marzia; Giaffreda, Andrea; Fazio, Simone; Pucillo, Leopoldo P.