1. Institute of Chemistry and Biochemistry; Freie Universität; 14195 Berlin Germany
2. Institute of Virology; University of Leipzig; 04103 Leipzig Germany
3. Robert Koch Institute; Center for Biological Threats and Special Pathogens; 13353 Berlin Germany
4. Institute for Physics and IRIS Adlershof; Humboldt-Universität Berlin; 12489 Berlin Germany
5. Institute for Macromolecular Chemistry; University of Freiburg; 79104 Freiburg Germany