1. Department of Cranio-Maxillo-Facial Surgery; Nuremberg General Hospital; Nuremberg Germany
2. Department Interfacial Technology and Material Science and Department Cell and Tissue Engineering; Fraunhofer Institut for Interfacial Engineering and Biotechnology IGB; Stuttgart Germany
3. Department of Neurosurgery; Trauma Center Murnau; Murnau am Staffelsee Bavaria Germany
4. Department of Prosthodontics; University of Goettingen; Goettingen Germany