1. Center for Brain Imaging, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi, PR China;
2. International Joint Research Center for Advanced Medical Imaging and Intelligent Diagnosis and Treatment & Xi'an Key Laboratory of Intelligent Sensing and Regulation of Trans-Scale Life Information, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi, PR China;
3. Department of Orthopedic Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, PR China; and
4. School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, Shaanxi, PR China.