About the Authors
Center for Global Health and Development, Boston University, Boston, Massachusetts, United States of America
Health Economics and Epidemiology Research Office, Department of Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
Center for Global Development, Washington, District of Columbia, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: GMR MO. Analyzed the data: GMR MO. Wrote the first draft of the manuscript: GMR MO. Contributed to the writing of the manuscript: GMR MO. ICMJE criteria for authorship read and met: GMR MO. Agree with manuscript results and conclusions: GMR MO.