Helen Hislop, PhD, ScD, FAPTA, Professor Emerita, Department of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA and Jacqueline Montgomery, MA, PT, Former Director of Physical Therapy, Rancho Los Amigos Medical Center, Downey, CA; Former Clinical Professor, Department of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA