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ALS Economic Measurement, Silver Spring, Maryland (Mr Sensenig); Johns Hopkins School of Public Health, Baltimore, Maryland (Drs Resnick, Leider, and Bishai); and de Beaumont Foundation, Bethesda, Maryland (Dr Leider).
Correspondence: Jonathon P. Leider, PhD, Johns Hopkins School of Public Health, 615 N Wolfe St, Baltimore, MD 21205 (firstname.lastname@example.org).
Funding for this study was provided by the de Beaumont Foundation in a grant to the Johns Hopkins Bloomberg School of Public Health.
Dr Leider was a consultant to the de Beaumont Foundation. The other authors declare no conflicts of interest.
Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Web site (http://www.JPHMP.com).