Design: This was a randomized, controlled, crossover trial.
设计：这是一项随机对照的交叉试验。
RESEARCH DESIGN and METHODS This was a double-blind, randomized, crossover trial.
研究设计与方法本研究为一项双盲、随机、交叉试验。
Methods: 12 healthy male volunteers were recruited in this two-phase, randomized, crossover clinical trial.
方法：12名健康男性志愿者被纳入此次实验中。
Methods: 12 healthy male volunteers were recruited in this two-phase, randomized, crossover clinical trial.
方法：12名健康男性志愿者被纳入此次实验中。
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