1. Clinic of Fixed and Removable Prosthodontics and Dental Material Science; Center for Dental Medicine; University of Zurich; Zurich Switzerland
2. Department of Oral Implantology and Prosthetic Dentistry; Academic Center for Dentistry Amsterdam; MOVE Research Institute; Amsterdam The Netherlands
3. Effretikon Switzerland
4. Clinic for Preventive Dentistry, Periodontology and Cariology; Center for Dental Medicine; University of Zurich; Zurich Switzerland
5. Schellenberg Liechtenstein
6. Clinic of Fixed Prosthodontics and Biomaterials; School of Dental Medicine; University of Geneva; Geneva Switzerland