1. School of Dentistry, The University of Manchester; Coupland III Building, Oxford Road Manchester UK M13 9PL
2. Scottish Dental Clinical Effectiveness Programme, NHS Education for Scotland; University of Dundee, Dental Health Services Research Unit; Frankland Building, Small's Wynd Dundee UK DD1 4HN
3. School of Dentistry, The University of Manchester; Cochrane Oral Health Group; Coupland III Building, Oxford Road Manchester UK M13 9PL
4. University of Chicago; Pritzker School of Medicine, Division of Biological Sciences, Department of Pathology; 5841 South Maryland Avenue Chicago Illinois USA 60637-1470
5. New York University College of Dentistry; Department of Oral and Maxillofacial Pathology, Radiology and Medicine; 345 East 24th Street Schwartz Building New York USA 10010
6. University of Dundee; Division of Oral and Maxillofacial Clinical Sciences, School of Dentistry; Park Place Dundee Scotland UK DD1 4HR
7. King's College London; Clinical and Diagnostic Sciences; Bessemer Road Denmark Hill Campus London UK SE5 9RW
8. University College London; 256 Gray's Inn Road London UK WC1X 8LD