@misc{indiciaead61e2a09eac,
  title = {Problem-oriented CPC's.},
  author = {W A Tisdale},
  year = {1971},
  doi = {10.1056/nejm197106032842224},
  url = {https://pubmed.ncbi.nlm.nih.gov/5573848/},
  note = {Source identifier: 5573848}
}