1. Department of Biotechnology and Biophysics, Biozentrum, Julius Maximilians University Würzburg, Am Hubland, 97074 Würzburg, Germany
2. Department of Electron Microscopy, Biozentrum, Julius Maximilians University Würzburg, Am Hubland, 97074 Würzburg, Germany
3. Department of Imaging Science and Technology, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands