1. Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, Galveston, Texas, USA
2. Department of Internal Medicine, John Sealy School of Medicine, University of Texas Medical Branch at Galveston, Galveston, Texas, USA
3. Department of Microbiology and Immunology, Faculty of Pharmacy Cairo University, Cairo, Egypt
4. Department of Molecular Genetics & Microbiology, College of Medicine, University of Florida, Gainesville, Florida, USA
5. Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, USA