1 Department of Orthopaedics, Division of PM&R, West Virginia University, 1 Medical Center Drive, Box 9100, Morgantown, WV 26506, USA. Electronic address: [email protected].
2 Department of Rehabilitation Medicine, University of Washington, S-117 RCS, 1660 South Columbian Way, Seattle, WA 98108, USA. Electronic address: [email protected].