1. Berlin-Brandenburg Center for Regenerative Therapies (BCRT), Charité–Universitätsmedizin Berlin, Germany.
2. Institute for Medical Immunology, Charité–Universitätsmedizin Berlin, Germany.
3. Department of Materials, Imperial College London, London SW7 2AZ, UK.
4. Department of Bioengineering, Imperial College London, London SW7 2AZ, UK.
5. Institute for Biomedical Engineering, Imperial College London, London SW7 2AZ, UK.
6. Wyss Institute and Harvard School of Engineering and Applied Sciences, Cambridge, MA 02138, USA.
7. Department of Pharmaceutics and Pharmaceutical Chemistry, and Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA.
8. Julius Wolff Institute, Charité–Universitätsmedizin Berlin, Germany.