- 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;
- Received May 27, 2014
- Accepted May 31, 2014
- First published July 31, 2014.
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