@misc{indiciaeff40b3126e9a,
  title = {Scleroderma heart disease.},
  author = {E Fletcher and P Morton},
  year = {1967},
  doi = {10.1136/bmj.4.5580.657},
  url = {https://pubmed.ncbi.nlm.nih.gov/6059261/},
  note = {Source identifier: 6059261}
}