1. Vanderbilt Vaccine Research Program and Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center , Nashville, Tennessee , USA
2. Vanderbilt Vaccine Center, Department of Pediatrics, and Department of Pathology, Microbiology and Immunology, Vanderbilt University Medical Center , Nashville, Tennessee , USA
3. The Emmes Company , LLC, Rockville, Maryland , USA