1. Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
2. Imec, Kapeldreef 75, Leuven 3001, Belgium
3. Electron Microscopy Facility, Istituto Italiano di Tecnologia, via Morego 30, Genova 16163, Italy
4. cMACS, Department of Microbial and Molecular Systems, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
5. Max-Planck-Institute for Polymer Research, 55128 Mainz, Germany