From the Lund University, Lund, Sweden (JL); and American Journal of Physical Medicine and Rehabilitation, Philadelphia, Pennsylvania (JL, WRF).

All correspondence should be addressed to: Jan Lexell, MD, PhD, DPhil hc, Department of Health Sciences, Lund University, PO Box 157, SE-22100, Lund, Sweden.

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.