1. Department of Biochemistry and Molecular Biology IV, Veterinary Faculty, Complutense University of Madrid, Madrid, Spain.
2. Networking Center on Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, Aragon Institute of Health Sciences, Zaragoza, Spain.
3. Division of Cellular and Gene Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Bethesda, Maryland.
4. Department of Musculoskeletal Sciences, Katholieke Universiteit Leuven and Division Prometheus-Skeletal Tissue Engineering, K.U. Leuven Research and Development, Leuven, Belgium.