- Correspondence to Dr Michael M Ward, Intramural Research Program, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, NIAMS/NIH, Building 10 CRC, Room 4–1339, 10 Center Drive, Bethesda, MD 20892, USA;
- Received December 15, 2013
- Revised March 17, 2014
- Accepted April 13, 2014
- First published May 1, 2014.
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