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prospective study
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前瞻性研究
按照研究对象是否暴露于某因素或暴露于某因素的不同水平,将其分为暴露组和非暴露组,然后随访一定时间,观察和比较这两组的发病率或死亡率,以检验该暴露因素与疾病发生有无联系的假设是否成立的研究方法。是分析流行病学研究中重要方法之一,又称队列研究(cohort study)、发生率研究(incidence study)、随访研究(follow-up study)及纵向研究(longitudinal study)。
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the ultrasonic wave methods of determining residual stress
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The Umbrellas of Cherbourg
The Unbearable Lightness of Being
The Uncertainty of Hope
the underglaze blue and copper-red pavilion-style porcelain granary of the Yuan Dynasty in Fengcheng City
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the unify of motive and effect
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The Union Magazine
the union of five families which are responsible for each other
the united front for democracy
The United Kingdom of Great Britain and North Ireland
The United Kingdom Sports Law
The United Nations Commission on International Trade Law Model Law on Electronic Commerce
The United Nations Convention to Combat Desertification
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the United Nations Development Programme
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