1. Mem. ASME The Penn State Computational Biomechanics Group, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, 320 Leonhard Building, University Park, PA 16802
2. The Penn State Computational Biomechanics Group, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, 320 Leonhard Building, University Park, PA 16802
3. United States Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD 21001
4. Mem. ASME The Penn State Computational Biomechanics Group, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, 320 Leonhard Building, University Park, PA 16802;
5. Department of Biomedical Engineering, The Pennsylvania State University, 320 Leonhard Building, University Park, PA 16802 e-mail: