1. Surveillance and Response Unit, European Centre for Disease Prevention and Control, Solna, Sweden
2. Pallas, Health Research and Consultancy B.V., Rotterdam, the Netherlands
3. Department of Clinical and Experimental Medicine, University of Sassari, Sassari, Italy
4. Health Without Barriers – European Federation for Prison Health, Viterbo, Italy
5. Department of Health & Justice, Public Health England, London, UK
6. Public Health Unit, European Monitoring Centre on Drugs and Drug Addiction, Lisbon, Portugal