1. Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, China
2. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
3. International Institute for Nanotechnology, Evanston, Illinois 60208, United States
4. NUANCE Center, Northwestern University, Evanston, Illinois 60208, United States
5. Department of Orthopaedics & Traumatology, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, China
6. Translational Research Centre of Regenerative Medicine and 3D Printing Technologies of Guangzhou Medical University, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China