Direct Observed Therapy of Chronic Hepatitis C With Interferon‐Free All‐Oral Regimens at a Low‐Threshold Drug Treatment Facility—a New Concept for Treatment of Patients With Borderline Compliance Receiving Opioid Substitution Therapy. (June 2016) - Schìtz, Angelika; Moser, Stephan; Marchart, Katharina; Haltmayer, Hans; Gschwantler, Michael