Studies included in the systematic review and in the meta-analysis.

* studies excluded from meta-analysis
MSP: Methylation Specific PCR;
qMSP: quantitative real-time MSP;
NT: Normal cervical Tissue;
BCT: Benign Cervical Tissue;
AT: normal cervical tissues adjacent to the tumor;
ASCUS: Atypical Squamous Cells of Undetermined Significance;
LSIL: Low-grade Squamous Intraepithelial Lesion;
HSIL: High-grade Squamous Intraepithelial Lesion.
Studies included in the systematic review and in the meta-analysis.