1. The University of Manchester; Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health; Coupland Building 3 Oxford Road Manchester UK M13 9PL
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. Queen Mary University of London; Clinical and Diagnostic Oral Sciences, Barts and The London School of Medicine and Dentistry; Turner Street Whitechapel London UK E1 2AD
4. University of Split School of Medicine; Department of Research in Biomedicine and Health; Soltanska 2 Split Croatia 21000