@misc{indiciaeac2f5b1588a3,
  title = {Improving teaching Valsalva's maneuver.},
  author = {F B Simmons},
  year = {1992},
  doi = {10.1288/00005537-199208000-00022},
  url = {https://pubmed.ncbi.nlm.nih.gov/1495362/},
  note = {Source identifier: 1495362}
}