¹Board Certified Neurological Clinical Specialist, Physical Therapist, Clinical Research Center, National Institutes of Health, Bethesda, MD

²Research Physical Therapist, Functional and Applied Biomechanics Laboratory, Clinical Research Center, National Institutes of Health, Bethesda, MD

Correspondence: Earllaine Croarkin, PT, MPT, Clinical Research Center, National Institutes of Health, 10 Center Dr, MSC 1604, Bethesda, MD 20892 ([email protected]).

The authors declare no conflicts of interest.