Motion Analysis Center, Shriners Hospitals for Children, Chicago, IL, USA

Mercedes Rodriguez Celin, Jacqueline C. Simon, Joseph J. Krzak, Karen M. Kruger, Peter A. Smith & Gerald F. Harris

Orthopaedic and Rehabilitation Engineering Center, Marquette University, Milwaukee, WI, USA

Jacqueline C. Simon, Karen M. Kruger & Gerald F. Harris

Physical Therapy Program, College of Health Sciences, Midwestern University, Downers Grove, IL, USA

Joseph J. Krzak

Research and Instructional Services, Raynor Memorial Libraries, Marquette University, Milwaukee, WI, USA

Alissa V. Fial