@article{gupta_2009,  title={Leukoplakia of the anal verge with bleeding hemorrhoids: a case report},  volume={55},  ISSN={0104-4230},  url={https://doi.org/10.1590/S0104-42302009000400009},  DOI={10.1590/S0104-42302009000400009},  number={4},  journal={Revista da Associação Médica Brasileira},  publisher={Associação Médica Brasileira},  author={Gupta, Pravin J},  year={2009},  pages={382–383} }