1. Department of Molecular Medicine and the Center on Aging, Scripps Research, Jupiter, FL 33458, USA
2. Institute on the Biology of Aging and Metabolism and Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota Medical School, Minneapolis, MN 55415, USA
3. Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
4. Department of Orthopaedic Surgery, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
5. Steadman Philippon Research Institute, Vail, CO 81657, USA
6. Department of Orthopaedic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
7. Department of Orthopaedic Surgery, Catholic University of Rome School of Medicine, “A. Gemelli” University Hospital, Roma, Italy
8. Department of Comparative Medicine, University of Washington, Seattle, WA 98195, USA