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.