1. Department of Prosthodontics, University Hospital Erlangen, Glückstrasse 11, 91054 Erlangen, Germany
2. Institute of Medical Informatics, Biometry and Epidemiology (IMBE) of the Friedrich-Alexander-University, Erlangen-Nuremberg, Waldstrasse 6, 91054 Erlangen, Germany
3. Dental Clinic 1—Department of Operative Dentistry and Periodontology, Erlangen University Hospital, Glueckstrasse 11, 91054 Erlangen, Germany