1. The Lundquist Institute, Torrance, California, USA
2. Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
3. Department of Medical Microbiology/Immunology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
4. Department of Microbiology & Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA
5. Microbial Genetics, Interfaculty Institute of Microbiology and Infection Medicine Tübingen, University of Tübingen, Germany
6. UCSF School of Medicine, San Francisco, California, USA
7. Geffen School of Medicine at UCLA, Los Angeles, California, USA