- Correspondence to Dr Michael M Ward, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Building 10 CRC, Room 4-1339, Bethesda, MD 20892, USA;
- Received October 21, 2015
- Revised December 14, 2015
- Accepted December 21, 2015
- First published January 21, 2016.
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