About the Authors
Institute for Health Metrics and Evaluation, University of Washington, Seattle, Washington, United States of America
Population Studies Center, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
Abt Associates Inc., Bethesda, Maryland, United States of America
Department of Economics, University of Zambia, Lusaka, Zambia
The authors have declared that no competing interests exist.
Conceived and designed the experiments: SL EG NR FM CJLM. Analyzed the data: NF AS. Wrote the first draft of the manuscript: SL. Contributed to the writing of the manuscript: SL EG NF NR AS FM CJLM. ICMJE criteria for authorship read and met: SL NF AS NR FM CJLM EG. Agree with manuscript results and conclusions: SL NF AS NR FM CJLM EG.