About the Authors

Jennyfer Wolf

jennyfer.wolf@googlemail.com

Current address: Department of Public Health and Environment, World Health Organization, Geneva, Switzerland

Affiliation Department of Social and Environmental Health, London School of Hygiene and Tropical Medicine, London, United Kingdom

Ben Armstrong

Affiliation Department of Social and Environmental Health, London School of Hygiene and Tropical Medicine, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JW BA. Analyzed the data: JW. Contributed reagents/materials/analysis tools: JW BA. Wrote the paper: JW. Supervised the data analyses: BA.