About the Authors

Leena Merdad

lam641@mail.harvard.edu

Affiliations Department of Global Health and Population, Harvard School of Public Health, Boston, Massachusetts, United States of America, Department of Preventive Dental Sciences, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia

Kenneth Hill

Affiliation Harvard Center for Population and Development Studies, Cambridge, Massachusetts, United States of America

Wendy Graham

Affiliation Institute of Applied Health Sciences, School of Medicine and Dentistry, University of Aberdeen, Aberdeen, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: LM KH WG. Analyzed the data: LM. Wrote the paper: LM KH WG.