@misc{indiciae2a543bcac386,
  title = {Mitral stenosis: the picture changes.},
  author = {R W Portal},
  year = {1984},
  doi = {10.1136/bmj.288.6412.167},
  url = {https://pubmed.ncbi.nlm.nih.gov/6419840/},
  note = {Source identifier: 6419840}
}