1. Department of Plastic and Reconstructive Surgery; BG University Hospital Bergmannsheil, Ruhr-University Bochum; Germany
2. BGRCI, Berufsgenossenschaft Rohstoffe und chemische Industrie; Heidelberg Germany
3. Institute of Pathology, Ruhr-University Bochum; Germany
4. Department of Anatomy and Molecular Embryology; Ruhr University Bochum; Germany
5. Department of Cytology; Ruhr University Bochum; Germany
6. Department of Anatomy; University Duisburg; Essen Germany