Author Contributions: Mr Millett 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: Millett, Flores.
Acquisition of data: Millett.
Analysis and interpretation of data: Millett, Flores, Marks, Reed, Herbst.
Drafting of the manuscript: Millett, Flores, Marks, Reed, Herbst.
Critical revision of the manuscript for important intellectual content: Millett, Flores, Marks, Reed, Herbst.
Statistical analysis: Flores.
Administrative, technical, or material support: Millett, Flores, Marks, Reed, Herbst.
Study supervision: Millett.
Financial Disclosures: None reported.
Funding/Support: This work was conducted during the regular duty of the authors employed at the US Centers for Disease Control and Prevention (CDC) and was not funded by any other organization.
Role of the Sponsor: The CDC, through the manuscript clearance process, was substantially involved in the preparation, review, and approval of the manuscript.
Additional Contributions: We thank James Carey, PhD, Helen Ding, MD, MSPH, Tim Dondero, MD, Donna Hubbard McCree, PhD, MPH, RPh, Peter Kilmarx, MD, Timothy Mastro, MD, FACP, Yuko Mizuno, PhD, Marie Morgan, BA, ELS, CDC Division of HIV/AIDS Prevention; Fred Bloom, PhD, RN, Matthew Hogben, PhD, CDC Division of STD Prevention; Lee Warner, PhD, CDC Division of Reproductive Health, for their careful review and insightful comments on an earlier draft of the manuscript. We also thank the following investigators for graciously supplying additional data for this review: Elin Begley, MPH, Robert Chen, MD, Deborah Gust, PhD, James Heffelfinger, MD, and Ryan Wiegand, MS, CDC Division of HIV/AIDS Prevention; Juan Guanira, MD, MPH, Javier Lama, MD, Jorge Sánchez, MD, MPH, Asociación Civil Impacta Salud y Educación; Don Francis, MD, DSc, Carter Lee, MBA, Global Solutions for Infectious Diseases; Ying-Ming Arthur Chen, MD, MS, ScD, National Yang-Ming University; Kyle Bernstein, PhD, ScM, Jeffrey Klausner, MD, MPH, San Francisco Department of Public Health; Andrew Grulich, PhD, David Templeton, MBChB, University of New South Wales; Paul Coplan, MS, ScD, MBA, University of Pennsylvania; Liviana Calzavara, PhD, MA, University of Toronto; H. Hunter Handsfield, MD, William Lafferty, MD, University of Washington. No additional compensation was received by any of the individuals listed in this acknowledgment.