1. Institute of Molecular Pathobiochemistry, Experimental Gene Therapy and Clinical Chemistry (IFMPEGKC), Rheinisch-Westfälische Technische Hochschule (RWTH) University Hospital Aachen, D-52074 Aachen, Germany
2. Electron Microscopy Facility, Institute of Pathology, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University Hospital, D-52074 Aachen, Germany
3. Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrück, D-49076 Osnabrück, Germany