About the Authors
Harvard School of Public Health, Boston, Massachusetts, United States of America
Harvard University Initiative for Global Health, Cambridge, Massachusetts, United States of America
Center for Population and Development Studies, Harvard University, Cambridge, Massachusetts, United States of America
University of California San Francisco, San Francisco, California, United States of America
The authors have declared that no competing interests exist.
CJLM and ME designed the study. SCK, CM, NT, MTB, and TJI analyzed data and constructed figures and maps. CJLM, SCK, and ME wrote the paper.