@article{piel2018-29590471,
  author  = {Piel, Frédéric B. and Parkes, Brandon L. and Daby, Hima Iyathooray and Hansell, Anna and Elliott, Paul},
  title   = {{The challenge of opt-outs from NHS data: a small-area perspective}},
  journal = {Journal of Public Health},
  year    = {2018},
  doi     = {10.1093/pubmed/fdy059},
  pmid    = {29590471},
  url     = {https://doi.org/10.1093/pubmed/fdy059}
}