1. Department of Oral Medicine; Section of Oral Pathology & Medicine; University of Copenhagen; Copenhagen; Denmark
2. Department of Oral Pathology; University of Helsinki and HUSLAB; Helsinki; Finland
3. Department of Medical Biology; University of Tromsö; Tromsö; Norway
4. Section of Pathology; The Gade Institute; University of Bergen; Bergen; Norway
5. Department of Oral Surgery & Oral Pathology; Aarhus University; Aarhus; Denmark
6. Department of Medical Biosciences; Umeå University; Umeå; Sweden
7. Oral and Maxillofacial Department; Kuopio University Hospital; Kuopio; Finland
8. Department of Diagnostics & Oral Medicine; University of Oulu; Oulu; Finland
9. Department of Oral Pathology & Oral Radiology; University of Turku; Turku; Finland
10. Department of Oral Biology; University of Oslo; Oslo; Norway
11. Department of Oral and Maxillofacial Surgery/Pathology; VU Medical Center/ACTA; Amsterdam; The Netherlands
12. Department of Pathology; Martini Hospital/UMCG; Groningen; The Netherlands
13. Department of Oral Pathology; Malmö University, Malmö and Karolinska Institute; Stockholm; Sweden