1. Leibniz Institute of Photonic Technology, 07745 Jena, Germany
2. Friedrich Schiller University, Institute for Physical Chemistry, 07743 Jena, Germany
3. Friedrich Schiller University, Abbe Centre of Photonics, 07745 Jena, Germany
4. University Hospital, Center for Infectious Diseases and Infection Control, 07747 Jena, Germany