*2.2. Study Selection and Inclusion Criteria*

Case-control, cross-sectional, and cohort studies reporting HPV infection prevalence were selected.

The following inclusion criteria were considered:


Articles were excluded for the following reasons:


Article selection and data extraction were performed by two Authors and doublechecked (M.N. and D.B.), while discrepancies of opinions or disagreement were resolved by a third investigator (S.G.).
