Description of a seven-year prospective study of human papillomavirus infection and cervical neoplasia among 10000 women in Guanacaste, Costa Rica,.
Bratti MC, Rodríguez AC, Schiffman M, Hildesheim A, Morales J, Alfaro M, Guillén D, Hutchinson M, Sherman ME, Eklund C, et al. Rev Panam Salud Publica. 2004 Feb; 15(2):75-89.