1. University of Dundee; Population Health Sciences; Mackenzie Building Kirsty Semple Way Dundee Scotland UK DD2 4BF
2. NHS Education for Scotland; Scottish Dental Clinical Effectiveness Programme; Dundee Dental Education Centre Small's Wynd Dundee UK DD1 4HN
3. No affiliation; 31 Park Crescent Frenchay Bristol UK BS16 1NZ
4. Imperial College London; NIHR Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance; Du Cane Road London UK W12 OHS
5. University College London; Research Department of Primary Care and Population Health; Upper Floor 3, Royal Free Hospital Rowland Hill Street London UK NW3 2PF
6. University of Aberdeen; Health Services Research Unit, Division of Applied Health Sciences; Polwarth Building Foresterhill Aberdeen UK AB25 2ZD
7. University of Dundee; Population Health Sciences Division, Medical Research Institute; Dundee UK