1. Department of Microbiology and Immunology; University of Texas Medical Branch; Galveston TX USA
2. Department of Internal Medicine; University of Texas Medical Branch; Galveston TX USA
3. Department of Ophthalmology; University of Texas Medical Branch; Galveston TX USA
4. Department of Medicine; University of Alabama at Birmingham; Birmingham AL USA
5. Department of Pathology; University of Texas Medical Branch; Galveston TX USA