1. Department of Pharmaceutical Engineering, School of Engineering, China Pharmaceutical University, Nanjing, 211198, P. R. China
2. Department of Ultrasound, West China Hospital, College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610041, P. R. China
3. Institute of Orthopedics, The First Medical Center, Beijing Key Lab of Regenerative Medicine in Orthopedics, Chinese PLA General Hospital, Beijing, 100853, P. R. China
4. Med-X Center for Materials, Sichuan University, Chengdu, 610065, P. R. China