@misc{indiciae718cd393cac4,
  title = {Asthma and enkephalin.},
  author = {R J Butland and J Pang and D Geddes},
  year = {1980},
  doi = {10.1136/bmj.281.6236.387-b},
  url = {https://pubmed.ncbi.nlm.nih.gov/7437133/},
  note = {Source identifier: 7437133}
}