[1] Brigham & Womens Hosp, Div Pharmacoepidemiol & Pharmacoecon, Boston, MA 02115 USA
[2] Harvard Med Sch, Dept Med, Boston, MA USA
[3] Pfizer, New York, NY USA
[4] Harvard Med Sch, Dept Populat Med, Boston, MA USA
[5] Maastricht UMC, Dept Clin Pharm, Maastricht, Netherlands
[6] London Sch Hyg & Trop Med, London, England
[7] Agenzia Reg Sanita Toscana, Florence, Italy
[8] Univ Utrecht, Div Pharmacoepidemiol & Clin Pharmacol, Utrecht, Netherlands
[9] Univ Maryland, Sch Pharm, Pharmaceut Hlth Serv Res Dept, College Pk, MD 20742 USA
[10] FDA Ctr Drug Evaluat & Res, Greenbelt, MD USA
[11] Aetion Inc, New York, NY USA
[12] Erasmus MC, Rotterdam, Netherlands