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. This study was a prospective, randomized, controlled study.
研究设计：本研究为随机，对照，前瞻性研究。
Design: This is a prospective randomized study.
研究设计：前瞻性随机对照研究。
Prospective method was used in this study.
用前瞻性研究方法对两组进行比较分析。
Prospective method was used in this study.
用前瞻性研究方法对两组进行比较分析。
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