1. Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA
2. Department of Microbiology and Immunology, College of Letters & Science, Montana State, Bozeman, Montana, USA
3. Department of Infection Prevention and Control, Department of Internal Medicine, Division of Infectious Diseases, St Joseph Mercy Health System, Ann Arbor, Michigan, USA
4. Department of Pathology, Microbiology Laboratory, St Joseph Mercy Health System, Ann Arbor, Michigan, USA
5. Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA