From the Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, Maryland (RS, KMC-A, AP, J. Sinkowitz, J. Stilling, MAA, GC, PAC); and Division of Neuromodulation and Physical Medicine Devices, Office of Product Evaluation and Quality, Food and Drug Administration, Silver Spring, Maryland (GC).

All correspondence should be addressed to: Rajani Sebastian, PhD, CCC-SLP, Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, 600 N Wolfe St, Phipps 183, Baltimore, MD 21287.

R.S. and K.M.C.-A. are the cofirst authors.

Financial disclosure statements have been obtained, and no conflicts of interest have been reported by the authors or by any individuals in control of the content of this article.

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