@misc{indiciae86232d9a26eb,
  title = {Ambu valve: danger of wrong assembly.},
  author = {A W Grogono and J Porterfield},
  year = {1970},
  doi = {10.1093/bja/42.11.978},
  url = {https://pubmed.ncbi.nlm.nih.gov/5275101/},
  note = {Source identifier: 5275101}
}