@article{oliveira_oliveira_marques_souza_oliveira_2020,  title={Factors associated with spontaneous abortion: a systematic review},  volume={20},  ISSN={1519-3829},  url={https://doi.org/10.1590/1806-93042020000200003},  DOI={10.1590/1806-93042020000200003},  number={2},  journal={Revista Brasileira de Saúde Materno Infantil},  publisher={Instituto de Medicina Integral Prof. Fernando Figueira},  author={Oliveira, Maria Tânia Silva and Oliveira, Caline Novais Teixeira and Marques, Lucas Miranda and Souza, Cláudio Lima and Oliveira, Márcio Vasconcelos},  year={2020},  month={Apr},  pages={361–372} }