1. University of Dundee, Dental School & Hospital; Park Place Dundee Tayside UK DD1 4HN
2. Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester; Cochrane Oral Health; Coupland Building 3 Oxford Road Manchester UK M13 9PL
3. Dundee Dental School, University of Dundee; Division of Oral Health Sciences; Park Place Dundee Scotland UK DD1 4HR
4. University College Cork; Department of Epidemiology and Public Health; 4th Floor, Western Gateway Building, Western Road Cork Ireland