RT Journal Article SR Electronic T1 Author Response JF Demo Journal of Physical Therapy FD HighWire Press SP 707 OP 708 DO 10.demo/ptj.2013.93.5.707 VO 93 IS 5 A1 Riddle, Daniel L. A1 Stratford, Paul W. A1 Cleland, Joshua A. YR 2013 UL http://demo.highwire.org/content/93/5/707.abstract AB