[1] Univ Copenhagen, Sch Dent, Fac Hlth Sci, Dept Oral Diagnost, DK-2200 Copenhagen N, Denmark
[2] Roskilde Cty Hosp, Dept Pathol, Roskilde, Denmark
[3] Rigshosp, Bartholin Inst, Copenhagen, Denmark
[4] Rigshosp, Dept Otolaryngol Head & Neck Surg, Copenhagen, Denmark
[5] Rigshosp, Dept Pathol, Copenhagen, Denmark