[1] Trinity Coll Dublin, Dublin Dent Sch & Hosp, Dublin 2, Ireland
[2] Univ Manchester, Sch Dent, Manchester, Lancs, England
[3] Inst Postgrad Dent Educ, Dept Dentomaxillofacial Radiol, Jonkoping, Sweden
[4] Katholieke Univ Leuven, Sch Dent Oral Pathol & Maxillofacial Surg, Oral Imaging Ctr, Louvain, Belgium
[5] Univ Zurich, Clin Fixed & Removable Prosthodont & Dent Mat Sci, Ctr Dent Med, Zurich, Switzerland
[6] Univ Bern, Sch Dent Med, Dept Oral Surg & Stomatol, Bern, Switzerland
[7] Cavendish Imaging, London, England
[8] Katholieke Univ Leuven, Dept Periodontol, Sch Dent Oral Pathol & Maxillofacial Surg, Louvain, Belgium