[1] Org Drugs OKANA, Averof 21, Athens 10433, Greece
[2] Univ Sydney, Sydney Sch Med, Fac Med & Hlth, Cent Clin Sch, Sydney, NSW, Australia
[3] South Eastern Sydney Local Hlth Dist, Drug & Alcohol Serv, Sydney, NSW, Australia
[4] NSW Drug & Alcohol Clin Res & Improvement Network, Sydney, NSW, Australia