1. Division of Musculoskeletal Sciences, Department of Orthopedics and Rehabilitation, College of Medicine; Pennsylvania State University; 500 University Drive Hershey 17033 Pennsylvania
2. Department of Comparative Medicine; Pennsylvania State University College of Medicine; Hershey 17033 Pennsylvania
3. Department of Engineering Science and Mechanics; Pennsylvania State University; University Park 16802-6812 Pennsylvania
4. Department of Public Health Sciences; Pennsylvania State University College of Medicine; Hershey 17033 Pennsylvania
5. Department of Biomedical Engineering; Virginia Commonwealth University; Richmond 23284 Virginia