1. Department of Oral Surgery and Stomatology, School of Dental Medicine; University of Bern; Bern Switzerland
2. Department of Oral Medicine & Pathology; King's College London Dental Institute; London United Kingdom
3. Pathology Länggasse; Bern Switzerland
4. Department of Oral Surgery, The School of Dentistry; University of Birmingham; Birmingham United Kingdom
5. Department of Health Policy and Health Services Research; Boston University; Goldman School of Dental Medicine; Boston Masssachusetts