1. Department of Internal Medicine VI (Infectious Diseases, Immunology, Rheumatology and Pneumology), Medical University of Innsbruck, Innsbruck, Austria;
2. Department of Biology, Gilead Sciences, Inc., Foster City, CA;
3. Division of Hygiene and Medical Microbiology, Medical University of Innsbruck, Innsbruck, Austria;
4. The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia; and
5. Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE