RESEARCH DESIGN and METHODS This was a double-blind, randomized, crossover trial.
研究设计与方法本研究为一项双盲、随机、交叉试验。
Meanwhile, the application of case-crossover study in the field of traffic injuries research is also discussed.
同时探讨病例交叉研究方法在道路交通伤害研究中的适用性。
Meanwhile, the application of case-crossover study in the field of traffic injuries research is also discussed.
同时探讨病例交叉研究方法在道路交通伤害研究中的适用性。
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