Characteristics of studies included in the meta-analysis.

Abbreviations: PCR: polymerase chain reaction; PCR-RFLP: PCR-restriction fragment length polymorphism; RT-PCR: real time-PCR; AS-PCR: allele-specific-PCR; TaqMan: TaqManSNP; ND: not defined; HB: hospital-based; PB: population-based; HWE: Hardy-Weinberg equilibrium. Characteristics of studies included in the meta-analysis.缩写说明：PCR：聚合酶链式反应（polymerase chain reaction）；PCR-RFLP：聚合酶链式反应-限制性片段长度多态性（PCR-restriction fragment length polymorphism）；RT-PCR：实时聚合酶链式反应（real time-PCR）；AS-PCR：等位基因特异性聚合酶链式反应（allele-specific-PCR）；TaqMan：TaqMan；ND：未明确（not defined）；HB：医院为基础的（hospital-based）；PB：人群为基础的（population-based）；HWE：哈迪-温伯格平衡（Hardy-Weinberg equilibrium）。 本荟萃分析纳入的研究特征。