@misc{indiciaed0b637dbef3c,
  title = {Postural variation in second sound splitting.},
  author = {J C MacKenzie and M E Rosenberg and G Kroll and M Brandfonbrener},
  year = {1973},
  doi = {10.1378/chest.63.1.56},
  url = {https://pubmed.ncbi.nlm.nih.gov/4684114/},
  note = {Source identifier: 4684114}
}