title: The authors respond.
authors: Research Service, Michael E. DeBakey Veterans Affairs Medical Center, Houston, TX.
authors: Mon S
authors: MS
authors: Bryant
authors: Division of Rehabilitation Sciences, University of Texas Medical Branch, Galveston, TX.
authors: James E
authors: JE
authors: Graham
authors: Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, TX.
authors: Diana H
authors: DH
authors: Rintala
authors: Division of Rehabilitation Sciences, University of Texas Medical Branch, Galveston, TX.
authors: Elizabeth J
authors: EJ
authors: Protas
mesh_terms: D002183:Canes / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008297:Male; D010300:Parkinson Disease / Q000534:rehabilitation*; D014853:Walkers / Q000706:statistics & numerical data*; D016138:Walking / Q000502:physiology*