1. Department of Medical Imaging, First Affiliated Hospital of Medical College; Xi'an Jiaotong University; Xi'an; China
2. Life Sciences Research Center, School of Life Sciences and Technology; Xidian University; Xi'an; Shaanxi; China
3. 3rd Teaching Hospital; Chengdu University of Traditional Chinese Medicine; Chengdu; Sichuan; China
4. Institute of Biomedical Engineering in Medical School, Key Laboratory of Biomedical Information Engineering of Ministry of Education, First Affiliated Hospital of Medical College; Xi'an Jiaotong University; Xi'an; Shaanxi; China