1. From Birmingham VA Medical Center (E.T., P.H.), Birmingham, Ala; the Department of Psychology (E.T., G.U.), The University of Alabama at Birmingham, Ala; Hunter Holmes McGuire VA Medical Center (P.L.), Richmond, Va; Biomedical Engineering (P.L.), Virginia Commonwealth University, MCV Campus, Richmond, Va; and the Department of Physical Medicine and Rehabilitation (V.W.M.), University of Alabama at Birmingham, Ala.