1. Communicable Diseases Centre, National Institute of Public Health (NIJZ), Ljubljana, Slovenia
2. Regional Unit Nova Gorica, NIJZ, Nova Gorica, Slovenia
3. European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
4. Regional Unit Ljubljana, NIJZ, Ljubljana, Slovenia
5. Laboratory for Public Health Virology, National Laboratory of Health, Environment and Food (NLZOH), Ljubljana, Slovenia