1. Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong, SAR, China
2. Centre for Medical Image Computing and the Wellcome/EPSRC Centre for Interventional and Surgical Sciences, University College London, London, U.K.
3. School of Mechanical Engineering and Automation, Harbin Institute of Technology at Shenzhen, Shenzhen, China
4. Department of Electronic and Electrical Engineering, Southern University of Science and Technology, Shenzhen, China