1. National Reference Centre Measles, Mumps, Rubella and Regional Reference Laboratory WHO EURO, Division of Measles, Mumps, Rubella, and viruses affecting immunocompromised patients, Robert Koch Institute, Berlin, Germany
2. Laboratory for Virology, National Institute of Public Health of Slovenia, Ljubljana, Slovenia
3. Baden-Wuerttemberg State Health Office, District of Stuttgart Government, Stuttgart, Germany
4. Regional Institute of Public Health of Ljubljana, Slovenia