1. Center for Cellular Imaging and NanoAnalytics,
Biozentrum, University of Basel, Mattenstrasse
26, CH-4058 Basel, Switzerland
2. Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland
3. Swiss Nanoscience Institute, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland