Geraldine O'Dowd, BSc (Hons), MBChB (Hons), FRCPath, Consultant Diagnostic Pathologist, Lanarkshire NHS Board, Honorary Clinical Senior Lecturer, University of Glasgow, Glasgow, Scotland, Sarah Bell, BSc Med Sci(Hons), MBChB(Hons), DipFMS, FRCPath, Consultant Pathologist, Department of Pathology, Queen Elizabeth University Hospital, Glasgow, UK and Sylvia Wright, BSc(Hons), MBChB(Hons), FRCPath, DipFMS, PG Cert Mol Path, Consultant Pathologist, Department of Pathology, Queen Elizabeth University Hospital, Glasgow, UK