1. Department of Pediatrics, Baylor Scott & White Health , Temple, Texas , USA
2. Department of Medical Education, Texas A & M University College of Medicine , Temple, Texas , USA
3. Influenza Division of the National Center for Immunization and Respiratory Diseases (NCIRD), Centers for Disease Control and Prevention , Atlanta, Georgia , USA
4. Center for Health Research, Kaiser Permanente Northwest , Portland, Oregon , USA
5. Abt Associates , Atlanta, Georgia , USA