@misc{indiciae69a5ea2a93f0,
  title = {The "empty heart" sign.},
  author = {C S Hirsch and R E Zumwalt},
  year = {1986},
  doi = {10.1097/00000433-198607020-00006},
  url = {https://pubmed.ncbi.nlm.nih.gov/3740007/},
  note = {Source identifier: 3740007}
}