1. Department of Infectious Diseases Epidemiology, Centre for Epidemiology and Microbiology, National Institute of Public Health, Prague, Czech Republic.
2. Department of Epidemiology and Biostatistics, Third Faculty of Medicine, Charles University, Prague, Czech Republic.
3. Vaccines, Antivirals, and Evidence Generation, Pfizer Vaccines, Pfizer Inc, Collegeville, Pennsylvania, USA.
4. Department of Biostatistics, National Institute of Public Health, Prague, Czech Republic.
5. Pfizer Biopharmaceuticals Group, Prague, Czech Republic.
6. Vaccines, Antivirals, and Evidence Generation, Pfizer Vaccines, Pfizer Inc, Vienna, Austria.
7. Vaccines, Antivirals, and Evidence Generation, Pfizer Vaccines, Pfizer Inc, London, England.
8. Vaccines, Antivirals, and Evidence Generation, Pfizer Vaccines, Pfizer Inc, Paris, France.