@misc{indiciae1bdbc0231d4a,
  title = {Ejection fraction. What are its limits?},
  author = {L C Christianson},
  year = {1980},
  doi = {10.1378/chest.78.1.2},
  url = {https://pubmed.ncbi.nlm.nih.gov/7471839/},
  note = {Source identifier: 7471839}
}