@misc{indiciae43b72cd735b2,
  title = {Difficult asthma},
  author = {T Usherwood},
  year = {1999},
  doi = {10.1136/bmj.319.7217.1141a},
  url = {https://pubmed.ncbi.nlm.nih.gov/10531126/},
  note = {Source identifier: 10531126}
}