“…A number of studies with methadone maintenance or other drug treatment patients (Camacho, et al, 1996; Kleinman, et al, 1994; Malow, et al, 1992; Metzger, et al, 1991; Perdue, et al, 2003; Pilowsky, et al, 2011; Woody, et al, 1997), and drug users not in treatment (Johnson, et al, 2003; Johnson, et al, 2002; Simpson, et al, 1993; Strathdee, et al, 1997), including syringe exchange program participants (Kidorf, et al, 2010), have found that symptoms of psychological distress or dysfunction, particularly symptoms of depression, are associated with injection risk behavior, including sharing syringes and other equipment, number of sharing partners, sharing with strangers, and sharing with a person known to be HIV-positive.…”