1. Institute of Musculoskeletal Medicine, Dept. Molecular Medicine, University Hospital Münster, Westfälische Wilhelms-Universität Münster, Münster, Germany
2. Previous Address: Research Division of Biology and Pathobiology of the Skin, Department of Dermatology, Medical University of Vienna, Vienna, Austria
3. Institute of Musculoskeletal Medicine, Dept. Bone and Skeletal Research, University Hospital Münster, Westfälische Wilhelms-Universität Münster, Münster, Germany
4. Current Address: Children´s Cancer Research Institute, Vienna, Austria
5. Electron Microscopy Facility, Vienna Biocenter Core Facilities GmbH, Vienna, Austria
6. Current Address: Nexperion e.U.–Solutions for Electron Microscopy, Vienna, Austria
7. Imaging Unit, Department of Dermatology, Medical University of Vienna, Vienna, Austria