@article{hortal_meny_1993,  title={Difficulties encountered in a community-based study of acute respiratory infections in Uruguay},  volume={27},  ISSN={0034-8910},  url={https://doi.org/10.1590/S0034-89101993000200008},  DOI={10.1590/S0034-89101993000200008},  number={2},  journal={Revista de Saúde Pública},  publisher={Faculdade de Saúde Pública da Universidade de São Paulo},  author={Hortal, Maria and Meny, Miguel},  year={1993},  month={Apr},  pages={123–126} }