Design: This was a randomized, controlled, crossover trial.
设计：这是一项随机对照的交叉试验。
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。
Future randomized trials are warranted to confirm the survival benefit of this strategy.
有待进一步的随机试验来明确这一策略的生存受益。
Design: This is a prospective randomized study.
研究设计：前瞻性随机对照研究。
Methods Randomized block design was adopted in this study.
方法实验采用配伍组设计。
Methods: This study adopted simple randomized controlled design.
方法：本研究采用单纯随机对照研究设计。
Methods: This study adopted simple randomized controlled design.
方法：本研究采用单纯随机对照研究设计。
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