1. Department of Nanobiophotonics; Max Planck Institute for Biophysical Chemistry (MPIBPC); Am Fassberg 11 37077 Göttingen Germany
2. Department of Chemistry; St. Petersburg State University; Universitetskiy Pr. 26 198504 St. Petersburg Russia
3. German Cancer Research Center (DKFZ); Im Neuenheimer Feld 280 69120 Heidelberg Germany