Different prevalence and spectrum of malignancy between Chinese patients and American patients with rheumatoid arthritis: a comparative study by Zhi-Ming Ouyang, Yao-Wei Zou, Jie Pan, Ye Lu, Ying Yang, Qian-Hua Li, Jian-Da Ma, Pei-Wen Jia, Tao Wu, Yu-Ting Fan, Jian-Zi Lin, Xiu-Ning Wei, Kui-Min Yang, Yun Su, Lie Dai

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