1. Eastman Dental Hospital; Endodontics Unit; 256 Grays Inn Road London UK WC1X 8LD
2. The Dental School; Department of Oral and Maxillofacial Surgery; Framlington Place Newcastle Upon Tyne UK NE2 4BW
3. Peninsula Dental School; Oral Health Services Research; The John Bull Building, Tamar Science Park, Research Way Plymouth UK PL6 8BU
4. UCL Eastman Dental Institute; Unit of Periodontology and International Centre for Evidence-Based Oral Health; 256 Gray's Inn Road London UK WC1X 8LD
5. UCL Eastman Dental Institute; Unit of Endodontology; 256 Grays Inn Road London UK WC1X 8LD
6. UCL Eastman Dental Institute; Biostatistics Unit; 256 Gray's Inn Road London UK WC1X 8LD