1. Divisions of General Pediatrics and Adolescent Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland.
2. Department of Infectious Diseases, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
3. Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee.
4. Division of General Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
5. Divisions of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland.
6. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas.
7. Divisions of Adult and Pediatric Infectious Diseases, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland.