Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content + Download Section PDF ++ Catherine Goodman, PT, MBA, CBP ++ Medical Multimedia Group, Medical Writer ++ University of Montana ++ School of Pharmacy and Allied Health Sciences ++ Department of Physical Therapy ++ Faculty Affiliate ++ Missoula, MT + ++ Kevin Helgeson, PT, DHSc ++ Rocky Mountain University of Health Professions ++ Provo, UT