@misc{indiciae5a49e93620d4,
  title = {Primary concern.},
  author = {M A Simpson},
  year = {1972},
  doi = {10.1016/s0140-6736(72)91356-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/4114085/},
  note = {Source identifier: 4114085}
}