- Correspondence to Professor Zhanguo Li, Department of Rheumatology and Immunology, Peking University People's Hospital, 11 Xizhimen South Street, Beijing 100044, China; or Professor Xiaoyan Qiu, Department of Immunology, School of Basic Medical Science, Peking University, 38 Xueyuan Road, Beijing 100191, China; or Professor Philip L Cohen, Department of Medicine, Temple University, 3322 North Broad Street, Room 201, Philadelphia, PA 19140, USA;
- Accepted April 14, 2013
- First published May 3, 2013.
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