1. Department of Internal Medicine, Division of Geriatric and Palliative Medicine, University of Michigan Medical School, Ann Arbor
2. Henry Ford Health System, Detroit
3. Department of Internal Medicine, Division of Infectious Diseases, University of Michigan Medical School, Ann Arbor
4. Department of Internal Medicine, Division of Infectious Diseases, Veterans Affairs Ann Arbor Healthcare System, Michigan
5. Department of Microbiology, Queen Mary Hospital, Hong Kong Special Administrative Region, China
6. Infection Control Team, Queen Mary Hospital, Hong Kong Special Administrative Region, China
7. Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia
8. Wayne State University School of Medicine, Detroit
9. Geriatrics Research Education and Clinical Center, Veterans Affairs Ann Arbor Healthcare System, Michigan