Accepted for Publication: March 2, 2011.
Author Contributions: Study concept and design: Wang, Nichols, and Austin. Acquisition of data: Wang and Nichols. Analysis and interpretation of data: Wang and Austin. Drafting of the manuscript: Wang. Critical revision of the manuscript for important intellectual content: Wang, Nichols, and Austin. Statistical analysis: Wang. Administrative, technical, and material support: Nichols and Austin. Study supervision: Wang.
Financial Disclosure: None reported.
Funding/Support: Dr Austin was supported by grant T71-MC00009-17 from the Leadership Education in Adolescent Health Project, Maternal and Child Health Bureau, HRSA.
Disclaimer: The findings and conclusions in this report are those of the authors and do not necessarily represent the official positions of the Centers for Disease Control and Prevention.
Additional Contributions: We thank Kamryn T. Eddy, PhD, Stephanie L. Ross, BA, and David B. Herzog, MD, for providing recovery rate estimates for our study, and Daniel Chapman, PhD, for his thoughtful review of a draft version of the manuscript.