@misc{indiciae6a267ac542de,
  title = {What is a beta-blocker?},
  author = {R H Thompson and E Letley},
  year = {1967},
  doi = {10.1016/s0140-6736(67)90656-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/4168579/},
  note = {Source identifier: 4168579}
}