Accepted for Publication: November 22, 2011.
Author Contributions: Mr Myles, Drs Buchanan, White, and Wu, and Ms King had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Myles, Buchanan, Singh, White, and Wu. Acquisition of data: Myles and Wu. Analysis and interpretation of data: Myles, Buchanan, King, White, Wu, and Ajani. Drafting of the manuscript: Myles, Buchanan, Singh, and Wu. Critical revision of the manuscript for important intellectual content: Myles, King, Singh, White, Wu, and Ajani. Statistical analysis: Myles, King, Singh, White, and Wu. Obtained funding: Wu. Administrative, technical, and material support: Myles, Buchanan, Singh, and Wu. Study supervision: Myles, Wu, and Ajani.
Financial Disclosure: None reported.
Disclaimer: The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.
Additional Contributions: We gratefully acknowledge the efforts of Lisa C. Richardson, MD, MPH, in contributing to this manuscript.