1. Dept. Exp. Biomolecular Physics/Applied Physics; Royal Institute of Technology-KTH, Albanova University Center; 10691 Stockholm Sweden
2. Institute of Physics; University of Belgrade; Pregrevica 118 11080 Belgrade-Zemun Serbia
3. PicoQuant GmbH; RudowerChaussee 29 12489 Berlin Germany
4. Dept. Exp. Biomolecular Physics/Applied Physics; Royal Institute of Technology-KTH, Science for Life Laboratory; 17165 Solna Sweden