1. Emerging Technologies Department, The MITRE Corporation, McLean, VA, USA
2. Department of Sports Medicine, The MedStar Health Union Memorial Hospital, Baltimore, MD, USA
3. Center for Applied Biomechanics and Rehabilitation Research, The MedStar Health National Rehabilitation Hospital, Washington, DC, USA
4. Department of Biomedical Engineering, The Catholic University of America, Washington, DC, USA
5. Kinesiology Department, Towson University, Towson, MD, USA