1. Department of Biology, Middle Tennessee State University, Murfreesboro, Tennessee.
2. Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee.
3. Elizabeth B. Lamb Center for Pediatric Research, Vanderbilt University School of Medicine, Nashville, Tennessee.
4. Department of Biology, Austin Peay State University, Clarksville, Tennessee.
5. Department of Surgery, Vanderbilt University School of Medicine, Nashville, Tennessee.
6. Department of Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee.