@article{norman_russell_macnaughton_2014,  title={The payment for performance model and its influence on British
          general practitioners' principles and practice},  volume={30},  ISSN={0102-311X},  url={https://doi.org/10.1590/0102-311X00149912},  DOI={10.1590/0102-311X00149912},  number={1},  journal={Cadernos de Saúde Pública},  publisher={Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz},  author={Norman, Armando Henrique and Russell, Andrew J. and Macnaughton, Jane},  year={2014},  month={Jan},  pages={55–67} }