1. Orthopaedic and Rehabilitation Engineering Center; Marquette University/Medical College of Wisconsin; Suite 323, 1515W. Wisconsin Avenue Milwaukee Wisconsin 53233
2. Department of Orthopaedic Surgery; Medical College of Wisconsin; Milwaukee Wisconsin
3. Division of Biostatistics, Institute for Health & Society; Medical College of Wisconsin; Milwaukee Wisconsin
4. Department of Orthopaedic Surgery; University of South Alabama College of Medicine; Mobile Alabama