1. Robert Koch Institute, Berlin, Germany; †Picoware GmbH, Berlin, Germany
2. Robert Koch Institute, Berlin, Germany; †Picoware GmbH, Berlin, GermanyCurrent affiliation: Epicentre, Geneva, Switzerland
3. Robert Koch Institute, Berlin, Germany; †Picoware GmbH, Berlin, GermanyCurrent affiliation: European Centre for Disease Prevention and Control, Stockholm, Sweden
4. Ministry of Health, Berlin, Germany