1. Infectious Disease Protection and Epidemiology Unit, State Office for Health and Social Affairs (LAGeSo), Federal State of Berlin, Berlin, Germany
2. District Health Office Steglitz-Zehlendorf of Berlin, Berlin, Germany
3. District Health Office Charlottenburg-Wilmersdorf of Berlin, Berlin, Germany
4. District Health Office Tempelhof-Schöneberg of Berlin, Berlin, Germany
5. National Reference Centre for Measles, Mumps and Rubella at the Robert Koch-Institute (RKI), Berlin, Germany
6. Vaccination Unit, Robert Koch-Institute (RKI), Berlin, Germany
7. Department for Health, Environment and Consumers Protection (SenGUV), Federal State of Berlin, Berlin, Germany