1 Public Health Ontario (Wilson, Science); Dalla Lana School of Public Health (Wilson); Centre for Vaccine-Preventable Diseases (Wilson), University of Toronto, Toronto, Ont.; Department of Pediatrics (Salvadori), Faculty of Medicine, McGill University, Montréal, Que.; Public Health Agency of Canada (Salvadori), Ottawa, Ont.; Division of Infectious Diseases (Science), Department of Paediatrics, Hospital for Sick Children; Department of Paediatrics (Science), University of Toronto, Toronto, Ont. sarah.wilson@oahpp.ca.
2 Public Health Ontario (Wilson, Science); Dalla Lana School of Public Health (Wilson); Centre for Vaccine-Preventable Diseases (Wilson), University of Toronto, Toronto, Ont.; Department of Pediatrics (Salvadori), Faculty of Medicine, McGill University, Montréal, Que.; Public Health Agency of Canada (Salvadori), Ottawa, Ont.; Division of Infectious Diseases (Science), Department of Paediatrics, Hospital for Sick Children; Department of Paediatrics (Science), University of Toronto, Toronto, Ont.