Barbiani, R.; Junges, J. R.; Nora, C. R. D.; Asquidamini, F. The Scientific Literature on Access Within the Brazilian National Health System in Brazil: Advances, Limitations, and Challenges . Saúde Soc. 2014, 23 (3), 855-868. https://doi.org/10.1590/S0104-12902014000300010.