About the Authors

Richard G. Watt

r.watt@ucl.ac.uk

Affiliation Department of Epidemiology and Public Health, University College London, London, United Kingdom

Georgios Tsakos

Affiliation Department of Epidemiology and Public Health, University College London, London, United Kingdom

Cesar de Oliveira

Affiliation Department of Epidemiology and Public Health, University College London, London, United Kingdom

Mark Hamer

Affiliation Department of Epidemiology and Public Health, University College London, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RGW GT CO MH. Analyzed the data: MH. Wrote the paper: RGW. Interpretation of data: RGW GT CO MH. Critical comments on drafts of paper: GT CO MH.