1. Department of Postgraduate Education, Center for Dentistry and Oral Medicine (Carolinum), University Hospital, Goethe University Frankfurt, Frankfurt am Main, Germany.
2. Private Practice for Oral Surgery and Implant Dentistry, Ludwigshafen, Germany.
3. Private Practice for Implant Dentistry, Berlin, Germany.
4. Dental Laboratory, Sirius Ceramics, Frankfurt am Main, Germany.
5. Department for Oral, Cranio-Maxillofacial and Facial Plastic Surgery, Medical Center, University Hospital, Goethe University Frankfurt, Frankfurt am Main, Germany.