Design Prospective cohort study.
设计前瞻性队列研究。
DESIGN: Prospective cohort study.
设计：前瞻性群组研究。
Design: Retrospective cohort study.
设计：回顾性队列研究。
Study Design. Prospective cohort study.
前瞻性的队列研究。
Study Design. Consecutive cohort study.
连续队列研究。
Study Design. Retrospective cohort study.
回顾性研究。
METHOD Design was prospective cohort study.
方法前瞻性队列研究。
Study Design: This is a prospective radiographic cohort study.
研究设计：该研究是一项前瞻性放射学队列研究。
Study Design. A retrospective matched cohort study with control group.
研究设计：对照配对回顾性队列研究。
Cohort study has a high clinical operation, but it is difficult to control bias.
队列研究临床可操作性高，但其控制偏倚差。
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。
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。
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