1. Hamlyn Centre for Robotic Surgery and the Department of Surgery and Cancer, Imperial College London, London, U.K
2. Hamlyn Centre for Robotic Surgery, Imperial College London, London, U.K
3. Department of Computer Science, University of Oxford, Oxford, U.K
4. Department of Surgery and Cancer, Imperial College London, London, U.K
5. Lightpoint Medical Ltd., Chesham, U.K