@misc{indiciae535786014c3e,
  title = {Beta-agonists and asthma.},
  author = {H Booth and E H Walters},
  year = {1993},
  doi = {10.1016/0140-6736(93)92400-n},
  url = {https://pubmed.ncbi.nlm.nih.gov/7901617/},
  note = {Source identifier: 7901617}
}