1. Department of Oral Surgery; Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London; London UK
2. Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health; The University of Manchester; Manchester UK
3. Cochrane Oral Health; Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester; Manchester UK
4. Department of Oral Surgery, Dental Institute; King's College London; London UK
5. Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London; London UK