1. GlaxoSmithKline Research Centre Zagreb Ltd., Prilaz Baruna Filipovića 29, 10000 Zagreb, Croatia
2. Division of Experimental Therapeutics, Walter Reed Army Institute of Research, 503 Robert Grant Avenue, Silver Spring, Washington, D.C. 20910, United States
3. Department of Microbiology and Immunology, University of Miami, Miami, Florida 33177, United States