1. Department of Microbial Pathogenesis, School of Dentistry, University of Maryland-Baltimore, Baltimore, Maryland, USA
2. Department of Microbiology and Immunology, School of Medicine, University of Maryland-Baltimore, Baltimore, Maryland, USA
3. The Rothman Institute, Department of Orthopaedic Surgery, Sidney Kimmel Medical College, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA
4. Northern Arizona University, Flagstaff, Arizona, USA
5. Division of Infectious Diseases and Hospital Epidemiology, University Zurich, University Hospital Zurich, Zurich, Switzerland