1. Tissue Engineering Laboratory and Berlin-Brandenburg Center for Regenerative Therapies; Department of Rheumatology and Clinical Immunology; Charité-Universitätsmedizin Berlin; Föhrer Str. 15 13353 Berlin Germany
2. Department for Orthopedic; Trauma and Reconstructive Surgery; Charité-Universitätsmedizin Berlin; Campus Benjamin Franklin, Garystrasse 5 14195 Berlin Germany