1. Department of Surgery, Christie Hospital and Holt Radium Institute, Wilmslow Road, Manchester M20 9BX, UK
2. Paterson Institute for Cancer Research, Christie Hospital and Holt Radium Institute, Wilmslow Road, Manchester M20 9BX, UK
3. Department of Radiotherapy, Christie Hospital and Holt Radium Institute, Wilmslow Road, Manchester M20 9BX, UK
4. Department of Histopathology, Withington Hospital, Manchester M20 8LR, UK