1. Department of Prosthodontics and Operative Dentistry; Tufts Dental School; Boston MA USA
2. Department of Stomatology and Oral Surgery; School of Dental Medicine, University of Geneva; Geneva Switzerland
3. Swiss Dental Clinics Group; Ardentis Clinique Dentaire; Geneva Switzerland
4. Swiss Dental Clinics Group; Ardentis Clinique Dentaire; Vevey Switzerland
5. Swiss Dental Clinics Group; Ardentis Clinique Dentaire; Lausanne Switzerland
6. Department of Research Administration; Tufts University School of Dental Medicine; Boston MA USA