1. Department of Oral Medicine; Dental Institute; Guy's and St Thomas’ NHS Foundation Trust and King's College London; London U.K
2. Biostatistics and Research Methods Centre; Dental Institute; King's College London; London U.K
3. Mucosal and Salivary Biology Division; Dental Institute; King's College London; London U.K
4. Birmingham Dental Hospital; Birmingham U.K
5. Eastman Dental Hospital; UCLH/Eastman Dental Institute; University College London; London U.K
6. University Dental Hospital; Manchester U.K
7. St John's Institute of Dermatology; Guy's and St Thomas's NHS Foundation Trust; London U.K