1. Lecturer and Specialist in Restorative Dentistry, Department of Oral and Dental Science, Division of Restorative Dentistry, Bristol Dental School and Hospital, Bristol, U.K.
2. Undergraduate Dental Student, Department of Oral and Dental Science, Division of Restorative Dentistry, Bristol Dental School and Hospital, Bristol, U.K.
3. Maxillofacial Prosthodontist, Maxillofacial Prosthetic Unit, Morriston Hospital, Swansea, U.K.
4. Laboratory Services Manager, Maxillofacial Prosthetic Unit, Morriston Hospital, Swansea, U.K.
5. Professor of Restorative Dentistry, Department of Oral and Dental Science, Division of Restorative Dentistry, Bristol Dental School and Hospital, Bristol, U.K.