先前的研究已经证明一个人患类风湿性关节炎的时间量是比伴随它的炎症更为重要的危险因素。
Previous studies have shown the amount of time a person has RA as a more important risk factor than the inflammation that accompanies it.
本例患者，这些因素与另一可能触发因素——昆虫叮咬结合，产生了可自衍生为MCC的炎性环境。
In our patient, these factors were combined with another possible trigger - an insect bite, generating an inflammatory milieu from which MCC could have derived.
目的探索类风湿性关节炎的危险因素。
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