1. Department of Prosthodontics; Faculty of Odontology; Malmö University; Malmö Sweden
2. Department of Periodontology and Oral Implantology; Dental School; Faculty of Medicine and Health Sciences; University of Ghent; Ghent Belgium
3. Department of Biomaterials and Biomimetics; New York University; New York USA
4. Department of Epidemiology and Health Promotion; New York University; New York USA