1. Division of Graduate and Postgraduate Prosthodontics, Tufts University School of Dental Medicine, Boston, MA 02111, USA
2. Department of Prosthodontics, Division of Removable Prosthodontics, Faculty of Dentistry, Aristotle University School of Health Sciences, 54124 Thessaloniki, Greece
3. Private Practice Limited to Prosthodontics, 54622 Thessaloniki, Greece
4. Private Practice Limited to Periodontics, 54623 Thessaloniki, Greece
5. Private Practice, 54622 Thessaloniki, Greece
6. Private Practice Limited to Prosthodontics, 00198 Rome, Italy