@misc{indiciae989dd12e900f,
  title = {Letter: The brass-ring sign.},
  author = {H E Reid},
  year = {1974},
  doi = {10.1016/s0140-6736(74)91295-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/4133673/},
  note = {Source identifier: 4133673}
}