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Z. Zong, Center of Infectious Diseases, West China Hospital (Huaxi), Guoxuexiang 37, Chengdu 610041, China (zongzhiy@scu.edu.cn).
D. M. S. has received grants from the Public Health Agency of Canada for influenza vaccine effectiveness estimation.
G. D. S. has received grants from Pfizer for investigator-initiated studies unrelated to influenza vaccine and provided paid expert testimony for the Ontario Nurses Association, the Quebec Ministry of Justice, and GlaxoSmithKline.
© The Author(s) 2019. Published by Oxford University Press for the Infectious Diseases Society of America. CC BY NC ND 4.0