[1] Univ Hertfordshire, Sch Pharm, ReDNet Project, Hatfield AL10 9AB, Herts, England
[2] Univ Hertfordshire, Sch Pharm, Psychonaut Web Mapping Project, Hatfield AL10 9AB, Herts, England
[3] HPFT Addict Directorate, Hatfield, Herts, England
[4] Kings Coll London, Natl Addict Ctr, Inst Psychiat, Psychonaut Web Mapping Project, London WC2R 2LS, England
[5] Univ Roma La Sapienza, Sch Med, Psychiat & Clin Psychol Dept, Rome, Italy
[6] Serv Salute Reg Marche, Psychonaut Web Mapping Project, Ancona, Italy
[7] IAPS IMIM Hosp Mar UAB, Psychonaut Web Mapping Project, Barcelona, Spain
[8] Bergen Clin Fdn, Psychonaut Web Mapping Project, Ctr Competence, Bergen, Norway
[9] A Clin Fdn, Psychonaut Web Mapping Project, Dept Commun, Helsinki, Finland
[10] Hosp Univ Duisburg Essen, LVR Hosp Essen, Dept Psychiat & Psychotherapy, Psychonaut Web Mapping Project,Addict Res Grp, Essen, Germany
[11] De Sleutel Tech Bedrijfseen Heid Provincialaat Br, Psychonaut Web Mapping Project, Ghent, Belgium