About the Authors
- Thomas R. Hird
- Nicholas C. Grassly
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* E-mail: n.grassly@imperial.ac.uk
Affiliation Department of Infectious Disease Epidemiology, Imperial College London, Norfolk Place, London, United Kingdom
Competing Interests
NCG is a member of the WHO working group on IPV that reports to the Strategic Advisory Group of Experts (SAGE) on Immunization. Otherwise, the authors have declared that no competing interests exist.