Affiliation: | 1.Department of Public Health Sciences, University of Alberta and Institute of Health Economics, Edmonton, Alberta;2.GlaxoSmithKline Canada, Toronto, Ontario (formerly with Wyeth-Ayerst Canada, Inc);3.Aventis Canada, Toronto, Ontario;4.Department of Biostatistics, University of Toronto, Ontario;5.Division of Infectious Diseases, The Hospital for Sick Children and University of Toronto, Toronto, Ontario |