@misc{indiciaee5864b5a353b,
  title = {Updated Kiel classification.},
  author = {M A Richards and A G Stansfeld},
  year = {1988},
  doi = {10.1016/s0140-6736(88)91740-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/2895854/},
  note = {Source identifier: 2895854}
}