1. Department of Microbial Pathogenesis, School of Dentistry, University of Maryland—Baltimore, Baltimore, Maryland, USA
2. Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
3. Graduate Program in Life Sciences, Molecular Microbiology and Immunology Program, University of Maryland—Baltimore, Baltimore, Maryland, USA
4. Department of Biological Sciences, Northern Arizona University, Flagstaff, Arizona, USA
5. Department of Microbiology and Immunology, School of Medicine, University of Maryland—Baltimore, Baltimore, Maryland, USA