1Correlation Network, Amsterdam, The Netherlands
2European Network of People Who Use Drugs, London, UK
3Department of Social and Environmental Research, London School of Hygiene and Tropical Medicine, London, UK
4Programme on Substance Abuse, Public Health Agency of Catalonia, Autonomous Government of Catalonia, Barcelona, Spain
5Clinic for Infectious Diseases and Febrile Illnesses, University Medical Centre Ljubljana, Ljubljana, Slovenia
6Fixpunkt e.V., Berlin, Germany