1. Laboratory of General Biochemistry and Physical Pharmacy, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium
2. Centre for Nano- and Biophotonics, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium
3. Department of Molecular Biotechnology, Ghent University, 9000 Ghent, Belgium
4. Max-Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany