- Correspondence to Dr Farshid Guilak, Department of Orthopaedic Surgery, Duke University Medical Center, 375 Medical Sciences Research Bldg., Box 3093, Durham, NC 27710, USA;
- Received March 21, 2014
- Revised May 29, 2014
- Accepted June 1, 2014
- First published July 10, 2014.
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