@article{sichero_villa_2006,  title={Epidemiological and functional implications of molecular variants of human papillomavirus},  volume={39},  ISSN={0100-879X},  url={https://doi.org/10.1590/S0100-879X2006000600002},  DOI={10.1590/S0100-879X2006000600002},  number={6},  journal={Brazilian Journal of Medical and Biological Research},  publisher={Associação Brasileira de Divulgação Científica},  author={Sichero, L. and Villa, L.L.},  year={2006},  month={Jun},  pages={707–717} }