@misc{indiciae10ae06030fac,
  title = {Technical introduction to echocardiography.},
  author = {P N Wells},
  year = {1989},
  doi = {10.1093/oxfordjournals.bmb.a072369},
  url = {https://pubmed.ncbi.nlm.nih.gov/2695214/},
  note = {Source identifier: 2695214}
}