1. Department of Internal Medicine/Division of Infectious Diseases, University of Michigan, Ann Arbor, Michigan, USA
2. Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, USA
3. Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, Michigan, USA
4. Medical Scientist Training Program, University of Michigan, Ann Arbor, Michigan, USA
5. Unit for Laboratory Animal Medicine, University of Michigan, Ann Arbor, Michigan, USA