DESIGN: a complete randomized controlled study.
设计：完全随机设计，对照实验研究。
DESIGN: Double blind, randomized controlled study.
设计：本研究采用双盲、随机、对照方法。
DESIGN: Randomized controlled study and analysis of variance.
设计：随机对照的实验，方差分析。
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。
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。
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