@misc{indiciae1433bfd39d45,
  title = {Exercise tests before and after heart valve replacement.},
  author = {D G Gilmour and S G Spiro and M J Raphael and S Freedman},
  year = {1976},
  doi = {10.1016/0007-0971(76)90028-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/990160/},
  note = {Source identifier: 990160}
}