@article{ferreira_2015,  title={PROFESSIONAL MASTER AND ITS CHALLENGES},  volume={42},  ISSN={0100-6991},  url={https://doi.org/10.1590/0100-69912015S01004},  DOI={10.1590/0100-69912015S01004},  journal={Revista do Colégio Brasileiro de Cirurgiões},  publisher={Colégio Brasileiro de Cirurgiões},  author={Ferreira, Lydia Masako},  year={2015},  pages={09–13} }