@misc{indiciae654170c3b527,
  title = {Hygiene standards for breathing systems?},
  author = {S L Snowdon},
  year = {1994},
  doi = {10.1093/bja/72.2.143},
  url = {https://pubmed.ncbi.nlm.nih.gov/8110562/},
  note = {Source identifier: 8110562}
}