About the Authors

Katy Robinson

Affiliation University of Bristol, Bristol, United Kingdom

Nick Fyson

Affiliation Imperial College London, London, United Kingdom

Ted Cohen

Affiliation Harvard School of Public Health, Boston, Massachussetts, United States of America

Christophe Fraser

Affiliation Imperial College London, London, United Kingdom

Caroline Colijn

c.colijn@imperial.ac.uk

Affiliation Imperial College London, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KR TC CF CC. Performed the experiments: KR NF CC. Analyzed the data: KR NF TC CF CC. Wrote the paper: KR TC CF CC.