1. Department of Ultrasound, Chongqing Key Laboratory of Ultrasound Molecular Imaging, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
2. State Key Laboratory of Organic−Inorganic Composites, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing 100029, P.R. China
3. Department of Radiology, Chongqing General Hospital of Chinese Academy of Sciences, Chongqing 400014, P.R. China
4. Department of General Medicine, Chongqing General Hospital of Chinese Academy of Sciences, Chongqing 400014, P.R. China
5. Department of Ultrasound, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
6. Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27101-4135, United States
7. Institute for Regenerative Medicine, Sechenov University, Moscow 119991, Russia
8. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing 100190, P.R. China
9. University of Chinese Academy of Sciences, Beijing 100049, P.R. China