Author Contributions: Dr Ezzati had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Gakidou, Ezzati.
Acquisition of data: Gakidou, Ezzati.
Analysis and interpretation of data: Gakidou, Oza, Vidal Fuertes, Li, Lee, Sousa, Hogan, Vander Hoorn, Ezzati.
Drafting of the manuscript: Gakidou, Ezzati.
Critical revision of the manuscript for important intellectual content: Gakidou, Oza, Vidal Fuertes, Li, Lee, Sousa, Hogan, Vander Hoorn, Ezzati.
Statistical analysis: Gakidou, Oza, Vidal Fuertes, Lee, Sousa, Hogan, Vander Hoorn, Ezzati.
Obtained funding: Gakidou, Ezzati.
Study supervision: Gakidou, Ezzati.
Financial Disclosures: None reported.
Funding/Support: This work was sponsored by National Science Foundation grant 0527536, by the Grand Challenges in Global Health, and by the Center for International Development at Harvard University.
Role of the Sponsor: The sponsors had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; or decision to submit the manuscript.
Additional Contributions: We thank Kenneth Hill, PhD, Harvard University, and Kevin Thomas, PhD, Pennsylvania State University, for discussion on demographic methods; Colin Mathers, PhD, World Health Organization, and Robert Black, MD, Johns Hopkins University, for discussion on disease-specific child mortality data and methods; Kenneth Hill and Barry Bloom, PhD, Harvard University, for comments on the manuscript; and Stanislava Nikolova, AB, Harvard University, for editorial help. None of those acknowledged received compensation for their contributions.