1. Department of Medicine, University of Washington School of Medicine, Seattle, WA 98195, USA.
2. Department of Pediatrics, University of Washington School of Medicine, Seattle, WA 98195, USA.
3. Department of Bacteriology, Osaka City University School of Medicine, Osaka 545-0051, Japan.
4. Department of Microbiology, University of Washington School of Medicine, Seattle, WA 98195, USA.
5. Department of Pharmacy, University of Washington School of Pharmacy, Seattle, WA 98195, USA.
6. Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
7. Ben May Department for Cancer Research, University of Chicago, Chicago, IL 60637, USA.
8. Department of Microbiology, The University of Chicago, Chicago, IL 60637, USA.
9. Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, WA 98195, USA.
10. University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA.
11. Department of Medicine, University of Nebraska School of Medicine, Omaha, NE 68105, USA.
12. Departments of Medicine and Pediatrics, University of Iowa, Iowa City, IA 52242, USA.