About the Authors

Jeffrey C Kwong

To whom correspondence should be addressed. E-mail: jeff.kwong@utoronto.ca

Affiliations Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada , Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada , Department of Family and Community Medicine, University of Toronto, Toronto, Ontario, Canada

Thérèse A Stukel

Affiliations Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada , Department of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada

Jenny Lim

Affiliation Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada

Allison J McGeer

Affiliations Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada , Mount Sinai Hospital, Department of Microbiology, Toronto, Ontario, Canada

Ross E. G Upshur

Affiliations Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada , Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada , Department of Family and Community Medicine, University of Toronto, Toronto, Ontario, Canada , Sunnybrook Health Sciences Centre Primary Care Research Unit, Toronto, Ontario, Canada

Helen Johansen

Affiliation Health Information and Research Division, Statistics Canada, Ottawa, Ontario, Canada

Christie Sambell

Affiliation Health Statistics Division, Statistics Canada, Ottawa, Ontario, Canada

William W Thompson

Affiliation Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Deva Thiruchelvam

Affiliation Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada

Fawziah Marra

Affiliation British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada

Lawrence W Svenson

Affiliations Alberta Health and Wellness, Edmonton, Alberta, Canada , Department of Public Health Sciences, University of Alberta, Edmonton, Alberta, Canada , Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada

Douglas G Manuel

Affiliations Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada , Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada

Competing Interests

AJM reports receiving travel grants from Sanofi Pasteur and Solvay Pharmaceuticals for speaking at meetings, and payment from Sanofi Pasteur for chairing a safety committee for a clinical trial.

Author Contributions

JCK was involved in all aspects of the study. TAS, JL, AJM, REGU, HJ, WWT, FM, LWS, and DGM provided input on study design and interpretation of results. TAS provided statistical expertise. CS, FM, and LWS assisted with data collection. DT assisted with data analyses. DGM provided overall supervision and guidance. JCK, TAS, JL, AJM, REGU, HJ, CS, WWT, DT, FM, LWS, and DGM critically reviewed and approved the manuscript for publication.