@article{tchernev_2009,  title={Sexually transmitted papillomavirus infections: epidemiology pathogenesis, clinic, morphology, important differential diagnostic aspects, current diagnostic and treatment options},  volume={84},  ISSN={0365-0596},  url={https://doi.org/10.1590/S0365-05962009000400009},  DOI={10.1590/S0365-05962009000400009},  number={4},  journal={Anais Brasileiros de Dermatologia},  publisher={Sociedade Brasileira de Dermatologia},  author={Tchernev, Georgi},  year={2009},  month={Jul},  pages={377–389} }