1. Consultant/Senior Lecturer, Department of Restorative Dentistry, Queen's University of Belfast, School of Clinical Dentistry, Royal Victoria Hospital, Belfast BT12 6BP, Northern Ireland
2. Reader/Consultant, Department of Restorative Dentistry, Queen's University of Belfast, School of Clinical Dentistry, Royal Victoria Hospital, Belfast BT12 6BP, Northern Ireland
3. Senior Lecturer/Consultant, University Dental School and Hospital, Wilton, Cork, Republic of Ireland
4. Lecturer, Department of Restorative Dentistry, University College Cork, University Dental School and Hospital, Wilton, Cork, Republic of Ireland
5. Lecturer, Dublin Dental Hospital and Practice Limited to Periodontics in Dublin, Republic of Ireland