About the Authors

Daniel A. Henk

d.henk@imperial.ac.uk

Affiliation The Department of Infectious Disease Epidemiology, Imperial College London, London, United Kingdom

Matthew C. Fisher

Affiliation The Department of Infectious Disease Epidemiology, Imperial College London, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DAH. Performed the experiments: DAH. Analyzed the data: DAH. Contributed reagents/materials/analysis tools: MCF. Wrote the paper: DAH MCF.