W. Dampier - Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, USA
Ch.H. Chung - Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, USA
M.R. Nonnemacher - Drexel University
B. Wigdahl - Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, USA