Author Contributions:Study concept and design: Chen, Wilson, Schlagenhauf.
Acquisition of data: Chen, Schlagenhauf.
Analysis and interpretation of data: Chen, Wilson, Schlagenhauf.
Drafting of the manuscript: Chen, Schlagenhauf.
Critical revision of the manuscript for important intellectual content: Chen, Wilson, Schlagenhauf.
Administrative, technical, or material support: Chen, Schlagenhauf.
Study supervision: Schlagenhauf.
Financial Disclosures: Dr Schlagenhauf has received research funding, honoraria for speaking at conferences, and consultancy fees from F. Hoffmann La Roche and GlaxoSmithKline. No other disclosures were reported.
Acknowledgment: We thank Monica Parise, MD, Parasitic Diseases Branch, Division of Parasitic Diseases, National Center for Infectious Diseases, US Centers for Disease Control and Prevention, for her thorough review and constructive comments. Dr Parise received no compensation for her contributions.