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Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN.
Correspondence to Jeffrey R. Basford, MD, PhD, Dept of Physical Medicine and Rehabilitation, Mayo Clinic, 200 First St SW, Rochester, M 55902.
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the author(s) or upon any organization with which the author(s) is/are associated.
