[1] Inst Therapy & Hlth Res IFT Nord, D-24114 Kiel, Germany
[2] Univ Med Ctr Schleswig Holstein, Inst Med Psychol & Med Sociol, Kiel, Germany
[3] Geisel Sch Med Dartmouth, Lebanon, NH USA
[4] Univ Glasgow, MRC CSI Social & Publ Hlth Sci Unit, Glasgow G12 8QQ, Lanark, Scotland
[5] Radboud Univ Nijmegen, Inst Behav Sci, NL-6525 ED Nijmegen, Netherlands
[6] ASL TO3, Piedmont Ctr Drug Addict Epidemiol, Grugliasco, Italy
[7] Univ Med Sci, Dept Toxicol, Environm Res Lab, Poznan, Poland