1. North Wales Organisation for Randomised Trials in Health; Bangor University; Bangor UK
2. Oral Pathology and Medicine; School of Dentistry, AlBaath University; Hama Australia
3. Department of Oral and Maxillofacial Sciences, School of Dentistry; Al-Farabi College; Riyadh Saudi Arabia
4. Division of Dentistry, School of Medical Sciences, Faculty of Biology, Medicine and Health; The University of Manchester; Manchester UK
5. Division of Oral and Maxillofacial Clinical Sciences, School of Dentistry; University of Dundee; Dundee UK
6. Department of Oral Surgery & Medicine, School of Dentistry; University of Dundee; Dundee UK