@article{starfield2005,
  title={Contribution of Primary Care to Health Systems and Health},
  author={Bárbara Starfield and Leiyu Shi and James Macinko},
  year={2005},
  journal={Milbank Quarterly},
  doi={10.1111/j.1468-0009.2005.00409.x},
  url={https://doi.org/10.1111/j.1468-0009.2005.00409.x}
}