@misc{indiciae867ec5e87b27,
  title = {The evolution of counterpulsation techniques.},
  author = {W C Birtwell and R H Clauss and C Dennis and D E Harken and H S Soroff},
  url = {https://pubmed.ncbi.nlm.nih.gov/787735/},
  note = {Source identifier: 787735}
}