1. Department of Ultrasound, Peking University Third Hospital, Beijing 100191, P.R. China
2. Key Laboratory of Protein and Peptide Pharmaceuticals, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, P.R. China
3. University of Chinese Academy of Sciences, Beijing 100049, P.R. China
4. Medical Isotopes Research Center and Department of Radiation Medicine, State Key Laboratory of Natural and Biomimetic Drugs, School of Basic Medical Sciences, Peking University, Beijing 100191, P.R. China
5. Medical and Health Analysis Center, Peking University, Beijing 100191, P.R. China
6. Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou 510005, P.R. China