@misc{indiciaeb7458d08c981,
  title = {Methacholine availability for bronchial challenge testing.},
  author = {T J Witek and E N Schachter},
  year = {1987},
  doi = {10.1164/arrd.1987.135.2.514},
  url = {https://pubmed.ncbi.nlm.nih.gov/3544987/},
  note = {Source identifier: 3544987}
}