1. Department of Computer Science, University of Liverpool, Liverpool, U.K.
2. Hamlyn Centre for Robotic Surgery, Imperial College London, London, U.K.
3. Automation and Control Institute, TU Wien, Wien, Austria
4. Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, Liverpool, U.K.
5. Department of Computer Science, National Tsing Hua University, Hsinchu, Taiwan
6. Mechatronics in Medicine Lab, Imperial College London, London, U.K.