1. Department of Pediatrics, Division of Infectious Diseases, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
2. Department of Pediatrics, Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania, USA
3. Division of Infectious Diseases, Nemours/Alfred I. duPont Hospital for Children, Wilmington, Delaware, USA
4. Clinic for Special Children, Strasburg, Pennsylvania, USA
5. Diagnostic Referral Division, Nemours/Alfred I. duPont Hospital for Children, Wilmington, Delaware, USA