1. Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC, USA
2. Department of Microbiology, The Ohio State University, Columbus, OH, USA
3. Division of Anatomy, The Ohio State University, Columbus, OH, USA
4. Departments of Pathology and Microbiology, Wexner Medical Center, The Ohio State University, Raleigh, NC, USA