@misc{indiciae619f3fa7c3e7,
  title = {Serial exercise testing in pulmonary embolism.},
  author = {R A Helmers and D C Zavala},
  year = {1988},
  doi = {10.1378/chest.94.3.517},
  url = {https://pubmed.ncbi.nlm.nih.gov/3409730/},
  note = {Source identifier: 3409730}
}