1. Department of Pathology Johns Hopkins University, Baltimore, Maryland, USA
2. Orthopaedic and Trauma Surgery Unit, Department of Surgery, Dentistry Paediatrics and Gynaecology of the University of Verona, Verona, Italy
3. Department of Plastic Surgery Johns Hopkins University, Baltimore, Maryland, USA
4. Departments of Molecular and Comparative Pathobiology and Neurology Johns Hopkins University, Baltimore, Maryland, USA
5. UCLA and Orthopaedic Hospital Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center, Los Angeles, California, USA
6. Center for Cardiovascular Science and MRC Center for Regenerative Medicine University of Edinburgh, Edinburgh, UK