1. Department of Preventive Medicine, the University of Tennessee Health Science Center, Memphis, Tennessee.
2. Bioinformatics Program, the University of Memphis, Memphis, Tennessee.
3. Department of Microbiology, Morrill Science Center IV North, University of Massachusetts, Amherst, Massachusetts.
4. Department of Pediatrics, University of Tennessee Health Science Center, Le Bonheur Children's Medical Center, Memphis, Tennessee.