1. University of Western Australia; School of Dentistry; Faculty of Medicine, Dentistry and Health Sciences 17 Monash Avenue Nedlands Western Australia Australia WA 6009
2. UCL Eastman Dental Institute; Unit of Paediatric Dentistry, Department of Craniofacial Growth and Development; 256 Grays Inn Road London UK WC1X 8LD
3. University of Dundee; School of Dentistry; Frankland Building, Small's Wynd Dundee Scotland UK DD1 4HN
4. University of Perugia; Dipartimento di Scienze Chirurgiche, Radiologiche e Odontostomatologiche; Ospedale S. Maria della Misericordia - S. Andrea delle Fratte Perugia Umbria Italy 06156
5. 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