About the Authors
Center for International Health and Development, Boston University School of Public Health, Boston, Massachusetts, United States of America
Health Economics Research Office, Wits Health Consortium, Johannesburg, South Africa
Infectious Diseases Section, Department of Medicine, Boston Medical Center, Boston, Massachusetts, United States of America
The authors have declared that no competing interests exist.
All authors contributed to developing the ideas presented in this paper, analyzing the data, and editing the manuscript.