1. Institute for Therapy and Health Research (IFT-Nord), Kiel, Germany;
2. Institute for Medical Psychology and Medical Sociology, University Medical Center Schleswig-Holstein, Kiel, Germany;
3. Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire;
4. MRC/CSI Social & Public Health Sciences Unit, University of Glasgow, Scotland;
5. Behavioural Science Institute, Radboud University, Nijmegen, Netherlands;
6. Piedmont Centre for Drug Addiction Epidemiology, ASL TO3, Grugliasco, Italy; and
7. Laboratory of Environmental Research, Department of Toxicology, University of Medical Sciences, Poznan, Poland