1. Cellular Pathology, Southampton University Hospitals NHS TrustTremona Road, Southampton SO16 6YD, UK
2. Lister HospitalCorey's Mill Lane, Stevenage, Hertfordshire SG1 4AB, UK
3. Department of Anaesthesia, The Hillingdon Hospital NHS TrustPield Heath Road, Uxbridge, Middlesex UB8 3NN, UK
4. Department of Surgery, The Hillingdon Hospital NHS TrustPield Heath Road, Uxbridge, Middlesex UB8 3NN, UK