Interferon-free Antiviral Treatment of Chronic Hepatitis C Virus Infection Among Opioid-substituted Patients

The primary objective of study will be to evaluate the effectiveness of interferon-free direct acting antivirals (IFN-free DAAs) in the treatment of chronic hepatitis C virus (HCV) among patients in opioid-substitution treatment (OST). We hypothesize that rates of sustained virological response will be comparable to non-OST populations. Secondary objectives include the evaluation of safety data, patients' adherence and patient reported outcome measures like functioning (disability), satisfaction with the treatment, health status, general health perceptions and health-related quality of life.