1. Department of Biology, University of Colorado at Colorado Springs, Colorado.
2. Department of Community Health and Behavior, Colorado School of Public Health, Aurora, Colorado.
3. Department of Epidemiology, Colorado School of Public Health, Aurora, Colorado.
4. Department of Pathology, Presbyterian Saint Lukes/Unipath 6C, Denver, Colorado.
5. Department of Pathology, Stony Brook University Medical Center, Stony Brook, New York.