1. Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee
2. Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee
3. Department of Pediatrics, Baylor College of Medicine and Texas Children’s Hospital, Houston, Texas
4. Department of Pediatrics, UPMC Children’s Hospital of Pittsburgh, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
5. Department of Pediatrics, Seattle Children’s Hospital, Seattle, Washington, Washington
6. Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio
7. Department of Pediatrics, Children’s Mercy–Kansas City, Kansas City, Missouri
8. Department of Pediatrics, University of Rochester School of Medicine and Dentistry, Rochester, New York
9. Department of Pediatrics, UCLA Mattel Children’s Hospital, Los Angeles, California
10. Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
11. Department of Health Policy, Vanderbilt University Medical Center, Nashville, Tennessee