[1] Univ Texas, Waggoner Ctr Alcohol & Addict Res, Austin, TX 78712 USA
[2] Univ Lund Hosp, Dept Lab Med, S-22185 Lund, Sweden
[3] Univ Edinburgh, Dept Psychiat, Edinburgh EH8 9YL, Midlothian, Scotland
[4] Med Univ S Carolina, Ctr Drug & Alcohol Programs, Charleston, SC 29425 USA
[5] Univ Helsinki, Res Unit Subst Aduse Med, FIN-00014 Helsinki, Finland
[6] Karolinska Inst, Stockholm, Sweden
[7] Univ Hosp, Alcohol Lab, Stockholm, Sweden