Funding for this research was provided by:
National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01AR064771)
National Natural Science Foundation of China (NSFC, No. 31630025, 81320108013 and 81571643)
Received: 19 February 2019
Accepted: 15 April 2019
First Online: 4 May 2019
Ethics approval and consent to participate
: The OAI study received ethical approval from the institutional review boards at each clinical site (Memorial Hospital of Rhode Island Institutional Review Board, The Ohio State University’s Biomedical Sciences Institutional Review Board, University of Pittsburgh Institutional Review Board, and University of Maryland Baltimore – Institutional Review Board) as well as the OAI Coordinating Center and the Department of Radiology and Biomedical Imaging at UCSF (Committee on Human Research at University of California, San Francisco). All participants provided written informed consent to participate in the OAI study.
: Not applicable.
: The authors declare that they have no competing interests.
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