1. Senior House Officer, Oral and Maxillofacial Sciences, University Dental Hospital of Manchester, Higher Cambridge Street, Manchester M15 6FH.
2. Lecturer, Professor, Oral and Maxillofacial Sciences, University Dental Hospital of Manchester, Higher Cambridge Street, Manchester M15 6FH.
3. Consultant, Oral and Maxillofacial Sciences, University Dental Hospital of Manchester, Higher Cambridge Street, Manchester M15 6FH.