1. Fraunhofer Institute for Molecular Biology and Applied Ecology IME; Forckenbeckstrasse 6 Aachen 52074 Germany
2. Research Center for Infectious Diseases; University of Würzburg; Josef Schneider Str. 2/ Bau D15 Würzburg 97080 Germany
3. Institute for Molecular Biotechnology; RWTH Aachen University; Worringer Weg 1 Aachen 52074 Germany