@misc{indiciae1c442344eeea,
  title = {Evaluation of PSRO effectiveness.},
  author = {R E Thompson},
  year = {1977},
  doi = {10.1056/nejm197707212970321},
  url = {https://pubmed.ncbi.nlm.nih.gov/559250/},
  note = {Source identifier: 559250}
}