1. School of Medicine, Dentistry and Biomedical Sciences Queen’s University Belfast UK
2. Division of Restorative Dentistry and Periodontology Dublin Dental University Hospital Trinity College Dublin Dublin Ireland
3. Department of Preventive and Restorative Dentistry College of Dental Medicine University of Sharjah Sharjah UAE
4. Department of Dentistry and Oral Health Aarhus University Aarhus Denmark
5. Institute of Dentistry, Faculty of Medicine and Dentistry Queen Mary University of London London UK