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。
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。
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。
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。
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。
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