1. Department of Pediatrics, University of Kentucky, Lexington, KY, USA
2. Gentle Medicine Associates, Boynton Beach, FL, USA
3. Vaccine Research and Development, Pfizer Inc, Collegeville, PA, USA
4. Vaccines Medical Development and Scientific and Clinical Affairs, Pfizer Inc, Collegeville, PA, USA
5. Vaccine Research and Development, Pfizer Inc, New York, NY, USA