1. Leibniz Institute of Photonic Technology, 07745 Jena, Germany
2. Abbe Center of Photonics, Friedrich Schiller University, 07745 Jena, Germany
3. Institute of Infectious Diseases and Infection Control, University Hospital, 07747 Jena, Germany
4. Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstraße 25, 64283 Darmstadt, Germany