1. Departments of Pediatrics and Microbiology, New York University School of Medicine, New York, New York
2. Department of Pediatrics, Columbia University College of Physicians and Surgeons, New York, New York
3. Department of Pediatrics, University of Iowa Carver College of Medicine, Iowa City, Iowa
4. Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
5. Division of Pediatric Infectious Diseases, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania