1. Department of Oral and Maxillofacial Surgery, Oral Medicine and Oral Pathology, Dublin Dental School and Hospital, Trinity College Dublin, Lincoln Place, Dublin 2, Ireland
2. Guy’s, King’s and St Thomas’ Dental Institute, Department of Oral Medicine and Pathology, Guy’s Hospital, London, UK
3. Louisiana State University Health Science Center, School of Dentistry, New Orleans, USA
4. Charité Zahnäartzliche Röntgenologie, Berlin, Germany; and
5. Department of Oral and Maxillofacial Pathology, Medicine and Surgery, Temple University School of Dentistry, Philadelphia, PA, USA