1. Dr. med. Dent, Department of Prosthodontics; Heidelberg University Hospital, University of Heidelberg; Heidelberg Germany
2. Prof. Dr. med. Dent, Department of Prosthodontics; Heidelberg University Hospital, University of Heidelberg; Heidelberg Germany
3. Prof. Dr. med. Dent, Department of Prosthodontics; Würzburg University Hospital, University of Würzburg; Würzburg Germany