1. Department of Orthopaedic Surgery; University of Pittsburgh School of Medicine; Pittsburgh Pennsylvania
2. Department of Pathology; University of Pittsburgh School of Medicine; Pittsburgh Pennsylvania
3. Department of Physical Medicine and Rehabilitation; University of Pittsburgh School of Medicine; Pittsburgh Pennsylvania
4. Department of Orthopaedic Surgery and Graduate Program in Cell and Developmental Biology; Thomas Jefferson University; Philadelphia Pennsylvania
5. Laboratory of Cell Proliferation and Ageing; Institute of Biosciences and Applications; National Centre for Scientific Research “Demokritos”; Athens Greece
6. Leni & Peter W May Department of Orthopaedics; Icahn School of Medicine at Mount Sinai; New York City New York 10029
7. Centre for Tissue Injury and Repair; Faculty of Medical and Human Sciences; University of Manchester M13 9PT and NIHR Manchester Musculoskeletal Biomedical Research Unit; Manchester Academic Health Science Centre; Manchester United Kingdom
8. Musculoskeletal and Regenerative Medicine Research Group; Biomolecular Sciences Research Centre; Sheffield Hallam University; Sheffield S1 1WB United Kingdom