Methodologic quality of cohort studies included in the meta-analysis.
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1A cohort study with a follow-up time >8 y was assigned one star.2A cohort study with a follow-up rate >75% was assigned one star.
1. 随访时间超过8年的队列研究（Cohort Study）将被赋予1颗星。 2. 随访率超过75%的队列研究将被赋予1颗星。
创建时间：
2015-12-02
