1. Julius Wolff Institute, Charité–Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany.
2. Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany.
3. Berlin-Brandenburg Center for Regenerative Therapies, Charité–Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany.
4. Wyss Institute, Center for Life Science Building, 3 Blackfan Circle, Boston, MA 02115, USA.
5. AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland.
6. Center for Musculoskeletal Surgery, Charité–Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany.
7. Department of Orthopaedic and Trauma Surgery, University Hospital Carl Gustav Carus, Technical University Dresden, Fetscherstraße 74, 01307 Dresden, Germany.