1. Nordic Research Network Ltd, Tampere, Finland
2. Pfizer Vaccine Clinical Research and Development, Pfizer Inc, Collegeville, PA, USA
3. Pfizer Vaccine Clinical Research and Development, Pfizer Ltd, Hurley, Berkshire, UK
4. Global Vaccines Research and Development, GlaxoSmithKline, Wavre, Belgium
5. Global Vaccines Research and Development, GlaxoSmithKline, Rixensart, Belgium
6. Pfizer Vaccine Research and Development, Pfizer Inc, Pearl River, NY, USA