Epiconcept, Epiconcept, Carlos III Institute of Health - Communicable Diseases Department, National Institute for Public Health and the Environment (RIVM), Semmelweis University, National Institute of Health Doutor Ricardo Jorge, Public Health Agency of Sweden, Croatian Institute of Public Health, Cantacuzino National Military Medical Institute for Research and Development, Consejería de Sanidad - Dirección General de Salud Pública, Robert Koch Institute - Department for Infectious Disease Epidemiology, Sorbonne University - Institut Pierre Louis d'Épidémiologie et de Santé Publique IPLESP, Health Service Executive, Universidad Pública de Navarra - IdiSNA, Navarra Institute for Health Research, NIVEL (Netherlands Institute for Health Services Research), Semmelweis University, National Health Institute Doutor Ricardo Jorge (INSA) - National Influenza Reference Laboratory, Public Health Agency of Sweden, Croatian Institute of Public Health, Cantacuzino National Military Medical Institute for Research and Development, Consejería de Sanidad - Dirección General de Salud Pública, Robert Koch Institute, Université Paris Saclay, Health Service Executive, Instituto de Salud Pública y Laboral de Navarra, National Institute for Public Health and the Environment (RIVM), National Institute for Public Health and the Environment (RIVM), European Centre for Disease Prevention and Control, European Centre for Disease Prevention and Control and Epiconcept