1. Vaccines, Antivirals and Evidence Generation, Pfizer Inc, Collegeville, PA, USA
2. Vaccines, Antivirals and Evidence Generation, Pfizer Ltd, Tadworth, Surrey, UK
3. The Women’s and Children’s Hospital and Robinson Research Institute and Adelaide Medical School, The University of Adelaide, Adelaide, South Australia, Australia
4. Department of Pediatrics Santa Casa de São Paulo School of Medical Sciences, São Paulo, Brazil