Carvalho, N. S. de; Winkler, A. M.; Formighieri, L.; Vianna, O. S.; Varaschin, P. V.; Carvalho, B. F. de; Gabardo, J. A Survey on Adolescent Sexual Behavior in a Public Brazilian High School: Some Data to HPV Vaccination Introduction. DST 2013, 25, 103-108.