1. University of Barcelona iOSFIX Aldosa Spain
2. Private practice Palma Spain
3. Kois Center Seattle Washington USA
4. Department of Reconstructive Dentistry and Gerodontology School of Dental Medicine University of Bern Bern Switzerland
5. Department of Restorative, Preventive and Pediatric Dentistry School of Dental Medicine University of Bern Bern Switzerland
6. Division of Restorative and Prosthetic Dentistry The Ohio State University Columbus Ohio USA
7. Department of Restorative Dentistry University of Washington Seattle Washington USA
8. Private Practice Seattle Washington USA
9. Department of Prosthodontics Tufts University Boston Massachusetts USA