[1] Oxford Outcomes, Oxford OX2 0JJ, England
[2] Univ Toronto, Div Epidemiol, Dalla Lana Sch Publ Hlth, Toronto, ON, Canada
[3] Univ Western Ontario, Ivey Sch Business, London, ON, Canada
[4] Univ Groningen, Dept Pharm, Unit PharmacoEpidemiol & PharmacoEcon, Groningen, Netherlands
[5] Univ Med Ctr Utrecht, Julius Ctr Hlth Sci & Primary Care, Bilthoven, Netherlands
[6] RIVM, Ctr Infect Dis Control, Bilthoven, Netherlands
[7] London Sch Hyg & Trop Med, Ctr Math Modelling Infect Dis, London WC1, England
[8] CHA Univ Quebec, Ctr Rech FRSQ, URESP, Quebec City, PQ, Canada
[9] Univ Laval, Dept Med Sociale & Prevent, Quebec City, PQ, Canada