“…DS patients have been found to be more chronically ill and have higher GHQ scores (Sato et al, 1995). Factors related to the health care system include convenience, waiting time, fees and doctor's reputation (Billinghurst & Whitfield, 1993;Bronstein et al, 2000;Leung et al, 2006;Lo et al, 1994;Yeung et al, 2004). Studies on DS in France have only focused on the prescription of drugs, namely High Dosage Buprenorphine (Feroni et al, 2005;Pradel et al, 2009), DS acting as a mechanism for obtaining multiple prescriptions and accounting for 15% to 20% of all prescriptions (Pradel et al, 2009).…”