[1] Karolinska Univ, Huddinge Hosp, Div Clin Pharmacol, Stockholm, Sweden
[2] Mario Negri Inst Pharmacol Res, Milan, Italy
[3] Univ Liverpool, Prescribing Res Grp, Sch Management, Liverpool L69 3BX, Merseyside, England
[4] Scottish Med Consortium, Glasgow, Lanark, Scotland
[5] Karolinska Univ, Hosp Solna, Karolinska Inst, Dept Med,Div Clin Pharmacol, Stockholm, Sweden
[6] AOK WidO, Wissensch Inst, Berlin, Germany
[7] Caisse Natl Assurance Maladie Travailleurs Salari, DSES, DEPP, Paris, France
[8] Hlth Insurance Inst Slovenia, Ljubljana, Slovenia