Methods A random, double blind, and placebo control study was conducted.
方法采用随机双盲、安慰剂平行对照研究。
Methods The random clinical study with double blind was used.
方法采取随机双盲对照临床研究。
Methods: Random, double blind and double central prospective study was adopted.
方法：采用随机、双盲、双中心前瞻性研究。
Methods The random and double blind method was used.
方法采用随机双盲方法。
METHODS: The double blind and random method was used.
方法：随机双盲双模拟对照试验。
METHODS: The double blind and random method was used.
方法：随机双盲双模拟对照试验。
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