1. European Monitoring Centre for Drugs and Drug Addiction; Interventions, Best Practice and Scientific Partners; Cais do Sodre' 1249-289 Lisbon Lisbon Portugal
2. University of Torino; School of Public Health; Via Santena 5bis Torino Italy 10126
3. London School of Hygiene & Tropical Medicine; Keppel Street London UK WC1E 7HT
4. Avogadro University; Department of Translational Medicine; Novara Italy