“…Recently, it has been suggested that more difficult-to-treat patients may do better in maintenance treatment using diamorphine (heroin). Clinical studies in Switzerland (Perneger et al, 1998;Rehm et al, 2001), the Netherlands (Blanken et al, 2005;van den Brink et al, 2003), Spain (March et al, 2006), Germany (Haasen et al, 2007;Verthein et al, 2008) and Canada (Oviedo-Joekes et al, 2009) have found heroin-assisted treatment (HAT) to be more effective than MMT in the treatment of methadone nonresponders. However, these studies have not analyzed the effect of HAT compared to MMT on BZD use.…”