@misc{indiciae0b9bd9084cb8,
  title = {Beta-blockade in the elderly.},
  author = {A van Zyl and L H Opie},
  year = {1986},
  doi = {10.1016/s0140-6736(86)91117-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/2870237/},
  note = {Source identifier: 2870237}
}