1. Department of Chemistry and Biomedical Sciences, Linnaeus University, 39182 Kalmar, Sweden
2. NanoLundLund University, Box 118, 22100 Lund, Sweden
3. Department of Bioengineering, Stanford University, 94305 Stanford, California, United States
4. Center for Microtechnologies, Technische Universität Chemnitz, 09126 Chemnitz, Germany
5. Solid State Physics, Lund University, Box 118, 22100 Lund, Sweden
6. B CUBE - Center for Molecular Bioengineering and Physics of Life, Technische Universität Dresden, D-01307 Dresden, Germany