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Moore DL, Le Saux N, Scheifele D, Halperin SA; Members of the Canadian Paediatric Society/Health Canada Immunization Monitoring Program Active (IMPACT).Moore DL, et al. Among authors: halperin sa.Pediatr Infect Dis J. 2004 Jun;23(6):568-71. doi: 10.1097/01.inf.0000130075.56368.02.Pediatr Infect Dis J. 2004.PMID: 15194842