“…Retention in treatment is similar (Fiellin et al, 2006;Bell et al, 2007;Moore et al, 2012) or even improved (Holland et al, 2012) in comparison with observed dosing. OST patients value unobserved dosing and consider it as an essential part of OST (Stone & Fletcher, 2003;Treloar, Fraser, & Valentine, 2007;Madden, Lea, Bath, & Winstock, 2008).…”