1. III. Physikalisches Institut, Georg August Universität, Göttingen, Germany
2. Department of Macromolecular Structures and NanoBioMedicine Initiative, Centro Nacional de Biotecnología (CNB-CSIC), Madrid, Spain
3. Institute of Molecular Life Sciences, University of Zürich, Zürich, Switzerland
4. Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany