Funding for this research was provided by:
National Institute of Arthritis and Musculoskeletal and Skin Disease (U54 AR057319 and U01 AR5187404)
Received: 6 January 2020
Accepted: 26 March 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: The University of Pennsylvania Institutional Review Board has approved this study (#825128). Informed consent will be obtained from all study participants.
: Not applicable.
: The authors declare that they have no competing interests.