1. Laboratory for Molecular Imaging and Photonics, KU Leuven, B-3001 Leuven, Belgium
2. Laboratory for Soft Matter and Biophysics, KU Leuven, B-3001 Leuven, Belgium
3. JCNS-4, Forschungzentrum Jülich, DE 85748 Jülich, Germany
4. IBI-4, Forschungzentrum Jülich, DE 52425 Jülich, Germany