1. Department of Periodontology and Oral Implantology, Temple University School of Dentistry, Philadelphia, PA.
2. Department of Microbiology and Immunology, Temple University School of Medicine, Philadelphia, PA.
3. Deceased; previously, Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, MI.
4. Deceased; previously, Department of Microbiology and Immunology, University of Michigan School of Medicine, Ann Arbor, MI.