Perceived barriers related to testing, management and treatment of HCV infection among physicians prescribing opioid agonist therapy : The C-SCOPE Study - Litwin, Alain H. (University of South Carolina School of Medicine) ; Drolet, Martine (Merck Canada Inc) ; Nwankwo, Chizoba (Merck & Co. Inc, New Jersey) ; Torrens, Marta (Universitat Autònoma de Barcelona. Departament de Psiquiatria i de Medicina Legal) ; Kastelic, Andrej (National Centre for the Treatment of Drug Addiction in Ljubljana) ; Walcher, Stephan (CONCEPT, Center for Addiction-Medicine, Munich) ; Somaini, Lorenzo (Addiction Treatment Centre (Biella, Itàlia)) ; Mulvihill, Emily (Kantar Health, New York) ; Ertl, Jochen (Kantar Health, New York) ; Grebely, Jason (The Kirby Institute, Sydney)