方法前期为一项前瞻性、随机、非盲对照临床试验，后期为队列研究。

Methods the clinical trial was a randomized non-blind parallel controlled study in the first 6 months.

youdao

方法前期为一项前瞻性、随机、非盲对照临床试验，后期为队列研究。

Methods the clinical trial was a randomized non-blind parallel controlled study in the first 6 months.

youdao