1. University of Liverpool; Department of Health Services Research; Waterhouse Building, Block B, 1st Floor, Room B113 1-5 Brownlow Street Liverpool UK L69 3GL
2. Queen Mary University of London, Barts & The London School of Medicine and Dentistry; Centre for Clinical and Diagnostic Oral Sciences, Institute of Dentistry; Turner Street Whitechapel London UK E1 2AD
3. NHS Western Cheshire; Public Health Department; 1829 Building, Countess of Chester Business Park Liverpool Road Chester UK CH2 1HJ
4. University of Liverpool; School of Dental Sciences; Pembroke Place Liverpool Merseyside UK L3 5PS