@misc{indiciae911fca4e9b5a,
  title = {Letter: Speaking aid.},
  author = {C G Evans and A Atkinson},
  year = {1974},
  doi = {10.1016/s0140-6736(74)90990-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/4143055/},
  note = {Source identifier: 4143055}
}