About the Authors
Department of Infectious Disease Epidemiology, Imperial College London, United Kingdom
: RFB was supported by an unrestricted educational grant from GlaxoSmithKline.
RFB, GPG, and NMF were involved in the conception and design of the mathematical model and analysis of model results. RFB drafted the manuscript and programmed the model, and GPG and NMF reviewed the work and gave comments at each stage. RFB, GPG, and NMF gave final approval for submission.