Main Characteristics and Results of the Eligible Studies.

Summary table of studies included in the meta-analysis. Abbreviations: CI, confidence interval; NR, not reported.Main Characteristics and Results of the Eligible Studies.本荟萃分析纳入研究的汇总表。缩写说明：CI为置信区间（confidence interval）；NR为未报道（not reported）。符合纳入标准研究的主要特征与研究结果。