1Department of Physical Therapy and Rehabilitation Science, Carver College of Medicine, University of Iowa, Iowa City, IA, USA, E-mail: keigavin@iu.edu
2Virtual Soldier Research Team, Center for Computer-Aided Design, College of Engineering, University of Iowa, Iowa City, IA, USA, E-mail: keigavin@iu.edu
3Center for Translational Musculoskeletal Research, School of Health and Rehabilitation Sciences, Indiana University, Indianapolis, IN, USA, E-mail: keigavin@iu.edu
4Dassault Systems SIMULIA Corp., 166 Valley St., Providence, RI, USA, E-mail: keigavin@iu.edu