1. Department of Prosthetic Dentistry Faculty of Medicine Carl Gustav Carus Technische Universität Dresden Dresden Germany
2. Institute of Epidemiology and Medical Biometry Ulm University Ulm Germany
3. Department of Prosthodontics University Medical Center Eppendorf Hamburg Germany
4. Department of Prosthodontics and Materials Science University of Leipzig Leipzig Germany
5. Department of Prosthodontics, Gerodontology and Biomaterials Dental School University of Greifswald Greifswald Germany
6. Department of Prosthodontics, Geriatic Dentistry and Craniomandibular Disorders Center for Dental and Craniofacial Sciences Charité ‐ Universitätsmedizin Berlin CC3 – Charité Berlin Germany
7. Department of Prosthetic Dentistry Faculty of Medicine Medical Center – University of Freiburg University of Freiburg Freiburg Germany
8. School of Dentistry Department of Prosthodontics, Propaedeutics and Dental Materials Christian‐Albrechts University Kiel Germany
9. Department of Prosthetic Dentistry and Dental Materials Science Medical Center Dental School and Clinics Saarland University Homburg Germany
10. Department of Prosthetic Dentistry Johannes‐Gutenberg University of Mainz Mainz Germany
11. Department of Prosthetic Dentistry Julius‐Maximilians University of Würzburg Würzburg Germany
12. Department of Prosthodontics Preclinical Education and dental Materials Science University of Bonn Bonn Germany
13. Department of Prosthetic Dentistry University Hospital LMU Ludwig‐Maximilians‐University Munich Germany
14. Department of Prosthetic Dentistry Justus‐Liebig University of Gießen Gießen Germany
15. Department of Prosthodontics and Biomaterials Medical Faculty RWTH Aachen University Aachen Germany
16. Department of Prosthetic Dentistry and Dental Material Science Friedrich‐Schiller University of Jena Jena Germany
17. Department of Prosthetic Dentistry Center of Dentistry Universitätsklinikum Ulm Ulm Germany