Methods: a multicenter, randomized, double blind, and placebo controlled clinical study was performed.

方法本次为一中心，随机，双盲，安慰剂对照临床观察。

youdao

Methods: a multicenter, randomized, double blind, and placebo controlled clinical study was performed.

方法本次为一中心，随机，双盲，安慰剂对照临床观察。

youdao