Institution: | 1. National Institute of Public Health–National Institute of Hygiene, Division of Epidemiology and Microbiology, Warsaw, Poland;2. World Health Organization, Department of Immunization, Vaccines and Biologicals, Quality, Safety and Standards, 20 Avenue Appia, 27 Geneva 1211, Geneva, Switzerland;3. National Institute of Public Health–National Institute of Hygiene, Division of Public Health, Warsaw, Poland |