@misc{indiciae641299e7e89b,
  title = {Left ventricular dysfunction--bedside Valsalva manoeuvre.},
  author = {M J Zema and B Restivo and T Sos and K W Sniderman and S Kline},
  year = {1980},
  doi = {10.1136/hrt.44.5.560},
  url = {https://pubmed.ncbi.nlm.nih.gov/7437198/},
  note = {Source identifier: 7437198}
}