RVR=Rapid Virologic Response (undetectable HCV Viral load at 4 weeks)
EVR=Early Virologic Response (≥ 2 log decline or HCV RNA < 600 IU/mL)
ETR=End Treatment Response (undetectable HCV viral load at the end of treatment)
SVR=Sustained Virologic Response (undetectable HCV RNA at 24 weeks after the end of treatment)
