Clinical Efficacy and Safety of Methotrexate with Hydroxychloroquine versus Methotrexate with Hydroxychloroquine and Leflunomide in Treating Active Rheumatoid Arthritis：a Head-to-head Comparative Trial　
CHEN Meiqing，WU Bin，LIU Fuan，CHEN Ziqing，LIN Qingyan，GAO Yisang，SUN Yuechi，CHEN Shiju，TANG Guobao
Chinese General Practice . 2021, (24): 3071 -3076 .  DOI: 10.12114/j.issn.1007-9572.2021.00.442

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