1. Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester; Cochrane Oral Health; JR Moore Building Oxford Road Manchester UK M13 9PL
2. The University of Manchester; Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health; JR Moore Building Oxford Road Manchester UK M13 9PL
3. University of Dundee; Division of Oral Health Sciences; Dental Hospital & School Park Place Dundee Scotland UK DD1 4HR
4. The University of Manchester; Division of Cancer Sciences; Manchester Academic Health Science Centre Manchester UK