Disclaimer: The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. Financial Support: By grant P30-AR053503 and T32-AR048522 from the National Institute of Arthritis and Musculoskeletal and Skin Diseases, award W81XWH-08-2-0032 from the Department of Defense and Armed Forces Institute of Regenerative Medicine, and the University of Pittsburgh Medical Center and Johns Hopkins University School of Medicine. Disclosures: Disclosures can be viewed at www.acponline.org/authors/icmje/ConflictOfInterestForms.do?msNum=L16-0588.
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