Khalid A El-Gendy* 1
, Gary K Atkin* 1
, Robert E Brightwell* 2
, Paul Richman3
and Jeremy I Livingstone1 
1Department of Surgery, Watford General Hospital, Vicarage Rd, Watford, WD18 0HB, Hertfordshire, UK
2Department of Biosurgery and Surgical Technology, Imperial College London, London, UK
3Department of Histopathology, Mount Vernon Hospital, Rickmansworth Rd, Northwood, Middlesex, HA6 2RN, UK