设计：对照实验研究。
DESIGN: a completely randomized case-control study.
设计：完全随机对照研究。
DESIGN: Completely randomized case-control study was adopted.
设计：完全随机对照实验研究。
Study Design. Prospectie case-control study testing a new diagnostic method.
研究设计：为试验一种新的诊断方法而做的预期病例对照研究。
A case control study nested in cohort was conducted.
本文进行了一项队列内病例对照研究。
Methods Case control study and self-control study in Chinese herbal treatment group were conducted.
方法采用病例对照研究和中药治疗组自身前后对照研究。
Neural tube defects; Case control study; Risk factors.
神经管畸形；病例对照研究；危险因素。
This type of study design, known as "case-control," cannot prove cause-and-effect.
这种类型的研究被称为病例对照研究，它不能够证明两者之间的因果关系。
方法断面对照研究。
DESIGN: Prospective case control study based on experimental animals.
设计：以实验动物为研究对象，前瞻性、对照研究。
设计：病例-对照研究。
DESIGN: Randomized case control study.
设计：随机对照研究。
DESIGN: Randomized case control study.
设计：随机对照研究。
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