“…OST is internationally recognized as one of the most effective harm reduction and HIV prevention and treatment strategies for opioid-dependent PWIDs (Altice, Kamarulzaman, Soriano, Schechter, & Friedland, 2010; Dutta et al, 2013; Kerr, Wodak, Elliott, Montaner, & Wood, 2004). It enhances quality-of-life, improves employment and social functioning (De Maeyer, van Nieuwenhuizen, Bongers, Broekaert, & Vanderplasschen, 2013; Korthuis et al, 2011; Nosyk, 2011), and reduces injection-related transmission of HIV and viral hepatitis (Gowing, Farrell, Bornemann, Sullivan, & Ali, 2008), crime, overdoses and health-related co-morbidity (Dennis et al, 2014; Fingleton, Matheson, & Jaffray, 2014; Michels, Stover, & Gerlach, 2007). For HIV-infected patients, it improves ART access, retention in care (Altice et al, 2011; Uhlmann et al, 2010) and adherence (Malta, 2010).…”