1. Private practice AthenaSmile Athens Greece
2. Department of Prosthodontics Tufts University, School of Dental Medicine Boston Massachusetts USA
3. Department of Clinical Science and Translational Medicine, University of Rome Tor Vergata Rome Italy
4. Department of Restorative Sciences Augusta University Augusta Georgia USA
5. Department of Restorative Dentistry and Biomaterials Sciences Harvard School of Dental Medicine Boston Massachusetts USA