Affiliation: | 1. Histopathology, Royal Surrey County Hospital, University of Surrey, , Guildford, UK;2. Department of Pathology, Sahlgrenska Cancer Centre, University of Gothenburg, , Gothenburg, Sweden;3. Oral Maxillo‐facial Surgery, Royal Surrey County Hospital, , Guildford, UK;4. Histology, Frimley Park Hospital, , Camberley, UK |