@misc{indiciae43423eff750b,
  title = {Large volume plastic spacers in asthma.},
  author = {D Keeley},
  year = {1992},
  doi = {10.1136/bmj.305.6854.598},
  url = {https://pubmed.ncbi.nlm.nih.gov/1393068/},
  note = {Source identifier: 1393068}
}