1. Department of Reconstructive Dentistry & Gerodontology, School of Dental Medicine University of Bern Bern Switzerland
2. Department of Restorative Dentistry and Biomaterials Sciences Harvard School of Dental Medicine Boston Massachusetts USA
3. Department of Conservative Dentistry and Orofacial Prosthetics, Faculty of Dentistry Complutense University of Madrid Madrid Spain
4. Division of Oral Restorative and Rehabilitative Sciences University of Western Australia Perth Western Australia Australia
5. Division of Regenerative and Implant Sciences, Department of Restorative Dentistry and Biomaterials Sciences Harvard School of Dental Medicine Boston Massachusetts USA
6. College of Dentistry Jouf University Sakaka Saudi Arabia
7. Private Practice La Plata Argentina
8. Department of Prosthodontics Indiana University School of Dentistry Indianapolis Indiana USA
9. Private Practice Ellecom The Netherlands