1. a Estonian Drug Monitoring Centre , National Institute for Health Development , Tallinn , Estonia
2. b Department of Public Health , University of Tartu , Tartu , Estonia
3. c Estonian Centre of Excellence in Behavioural and Health Sciences , Tartu-Tallinn , Estonia
4. d Department of Epidemiology and Biostatistics , National Institute for Health Development , Tallinn , Estonia
5. e CHESS, Stockholm University/Karolinska Institutet , Stockholm , Sweden
6. f Department of Health Strategy and Planning , National Institute for Health Development , Tallinn , Estonia
7. g Centre for Research on Drugs and Health Behaviour, London School of Hygiene & Tropical Medicine , University of London , UK
8. h Department of Epidemiology and Public Health , University College London , London , UK