- Correspondence to Dr Xuan Zhang, Department of Rheumatology and Clinical Immunology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China; and Dr Peter E Lipsky, Formerly National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, USA; firstname.lastname@example.org
- Received October 23, 2013
- Revised February 24, 2014
- Accepted March 1, 2014
- First published April 14, 2014.
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