1. Laboratory of Physics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, SI-1000 Ljubljana, Slovenia
2. Insttute of Biophysics and Nanosystems Research, Austrian Academy of Sciences c/o Sincrotrone Trieste, Strada Statale 14, 34012 Basovizza (Trieste), Italy
3. Laboratory of Clinical Biophysics, Faculty of Medicine, University of Ljubljana, Lipičeva 2, SI-1000 Ljubljana, Slovenia