To calculate incidence rates, both crude and standardised, mathematical definitions and expressions agreed upon by all the population cancer registries were used [5].

In the descriptive analysis, standard methods were used, including tables and figures to facilitate outcomes’ expression. The Chi-squared test was applied in order to evaluate the association between categorical variables; the t-Student test was used for continuous variables. Both Chi-squared and t-Student tests were applied using an alpha error equal to 0.05.