1. Tees, Esk and Wear Valley NHS Trust; Kirkstone Villa, Earls House Durham UK DH1 5RD
2. University of New South Wales; National Drug and Alcohol Research Centre; 36 King Street Randwick Sydney NSW Australia NSW 2025
3. European Monitoring Centre for Drugs and Drug Addiction; Interventions, Best Practice and Scientific Partners; Cais do Sodre' 1249-289 Lisbon Lisbon Portugal
4. Lazio Regional Health Service; Department of Epidemiology; Via di Santa Costanza, 53 Rome Italy 00198