1. Division of Restorative Dentistry & Periodontology Dublin Dental University Hospital, Trinity College Dublin Dublin Ireland
2. Department of Dentistry and Oral Health Aarhus University Aarhus Denmark
3. School of Dentistry The University of Queensland Herston Queensland Australia
4. School of Medicine Dentistry and Biomedical Sciences Queen's University Belfast Belfast UK
5. Department of Conservative Dentistry and Periodontology University Hospital of Würzburg Würzburg Germany
6. Department of Biomedical, Surgical and Dental Sciences Università degli Studi di Milano Milan Italy
7. Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milan Italy
8. Faculty of Medicine & Dentistry, Institute of Dentistry Queen Mary University of London London UK
9. Department of Operative Dentistry and Periodontology Friedrich‐Alexander‐University Erlangen‐Nuernberg Erlangen Germany
10. Department of Stomatology, Endodontics Section, School of Dentistry University of Sevilla Sevilla Spain
11. School of Dentistry, Institute of Clinical Sciences, College of Medical & Dental Sciences University of Birmingham Birmingham UK
12. Birmingham Community Healthcare NHS Trust Birmingham UK
13. Division of Periodontics, Section of Oral, Diagnostic and Rehabilitation Sciences, College of Dental Medicine Columbia University New York New York USA