1. University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin
2. University of New Mexico School of Medicine, Albuquerque, New Mexico
3. Department of Pathology and Laboratory Medicine, New Mexico VA Medical Center, Albuquerque, New Mexico
4. VAMC, Albuquerque, New Mexico
5. Department of Orthopedics and Rehabilitation, University of New Mexico School of Medicine, Albuquerque, New Mexico