1. Institute for Therapy and Health Research, Kiel, Germany;
2. Institute for Medical Psychology and Medical Sociology, University Hospital Schleswig-Holstein, Kiel, Germany;
3. Dartmouth Medical School, Lebanon, New Hampshire;
4. Behavioural Science Institute, Radboud University, Nijmegen, Netherlands;
5. Laboratory of Environmental Research, Department of Toxicology, University of Medical Sciences, Poznan, Poland;
6. Medical Research Council (MRC) Social & Public Health Sciences Unit, Glasgow, United Kingdom;
7. Directorate of Health, Reykjavik, Iceland;
8. University of Iceland, Reykjavik, Iceland;
9. Piedmont Centre for Drug Addiction Epidemiology, A.S.L. TO3 Grugliasco (TO), Italy; and
10. Avogadro University, Novara, Italy