1. Dr Ben-Nathan is a visiting professor from the Departments of Infectious Diseases and Biotechnology, The Israel Institute of Biological Research, Ness-Ziona, Israel.
2. Department of Oral Biology, College of Dentistry, Ohio State University, Columbus, OH 43210
3. Department of Microbiology, Immunology and Pathology, Virginia Commonwealth University, Medical College of Virginia, Richmond, VA 23298-0678, USA