1. Department of Ultrasound, National Clinical Research Center for Geriatrics, West China Hospital, College of Polymer Science and Engineering, Sichuan University, Chengdu 610041, China
2. Department of Ultrasound, Sichuan Key Laboratory of Medical Imaging, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan 637000, China
3. Laboratory of Anesthesia and Critical Care Medicine, Department of Anesthesiology, Translational Neuroscience Center, West China Hospital, Sichuan University, Chengdu 610041, China
4. Department of Pain Management, West China Hospital, Sichuan University, Chengdu 610041, China
5. Department of Chemistry and Biochemistry, Freie Universität Berlin, Takustrasse 3, 14195, Berlin, Germany
6. State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China