1. Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing 100084, China
2. Department of Biomedical Engineering, School of Computer and Information Technology, Beijing Jiaotong University, Beijing 100044, China
3. China Institute of Sport Science, Beijing 100061, China
4. Center for Biomedical Imaging Research, School of Medicine, Tsinghua University, Beijing 100084, China