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流行病学研究是现代医学研究的重要方法之一,为了得到真实的研究结果,在流行病学研究或推理过程中应注意消除或减少任何使所
Epidemiological research is one of the important methods for modern medical research. In order to obtain real research results, attention should be paid to eliminate or reduce any problems in epidemiological research or inference.