Table 2. Characterisation of relevant risk factors. Categorical variables are presented as frequencies and corresponding percentages of positive cases for each risk factor.

Risk factors	No	Percentage
Tobacco smokers (active)	2	3.4%
Tobacco smokers (ex-smoker)	1	1.7%
Family history of cancer	2	3.4%
Immunosuppression	17	29.3%
HIV+	2	3.4%
HBV+	14	24.1%
HCV	1	1.7%
HPV DNA+	25	43.1%