1. Laboratory of Materials and Metallurgy, College of Materials Science and Engineering, Chongqing University, Chongqing 400030, People's Republic of China
2. Institute of Smart System and Renewable Energy, College of Automation, Chongqing University, Chongqing 400030, People's Republic of China
3. Medical Image Processing Group, Department of Radiology, University of Pennsylvania, 423 Guardian Drive, Blockley Hall, 4th Floor, Philadelphia, Pennsylvania 19104, USA
4. ICT Research Center, Key Laboratory of Optoelectronic Technology and System of the Education Ministry of China, Chongqing University, Chongqing 400044, People's Republic of China