?:authorAffiliation
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[\'National Heart and Lung Institute, Imperial College London, London, UK. Electronic address: p.turner@imperial.ac.uk.\', \'Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK.\', \'Institut National de Santé Publique du Québec, Quebec City, Quebec, Canada; Université Laval, Faculty of Social Sciences, Quebec City, Quebec, Canada.\', \'National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Ga.\']
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