1 Center for Performance and Clinical Research (B.L.S. and J.D.M.) and Department of Orthopaedics and Rehabilitation (S.C.W. and B.K.P.), Walter Reed National Military Medical Center, America Building (#19), Room B-322, 8901 Wisconsin Avenue, Bethesda, MD, 20889. barri.schnall@med.navy.mil. jenna.montgomery@med.navy.mil. scott.wagner@amedd.army.mil. benjamin.potter@amedd.army.mil.
2 Biomechanics Laboratory, Naval Medical Center San Diego, 34800 Bob Wilson Drive, San Diego, CA 92134. marilynn.wyatt@med.navy.mil.