1. Department of Biomedical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
2. Advanced Biomaterials and Tissue Engineering Centre, Huazhong University of Science and Technology, Wuhan 430074, China.
3. Department of Materials, Imperial College London, London SW7 2AZ, UK.
4. Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK.
5. Department of Bioengineering, Imperial College London, London SW7 2AZ, UK.
6. Division of Biomaterials, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.