1. National Institute of Public Health–National Institute of Hygiene–National Research Institute, Department of Infectious Disease Epidemiology and Surveillance, Warsaw, Poland.
2. P95 Epidemiology and Pharmacovigilance, Leuven, Belgium.
3. Pfizer Global Medical Affairs, Vaccines, Vienna, Austria.
4. Patient and Health Impact, Pfizer R&D UK LTD, Walton Oaks, United Kingdom.
5. Vaccine Clinical Research and Development, Pfizer Inc, Pearl River, New York, USA.
6. Vaccine Medical Development & Scientific/Clinical Affairs, Pfizer Inc, Collegeville, Pennsylvania, USA.