@misc{indiciaed4ecc19c4387,
  title = {Respiratory questionnaires in COPD.},
  author = {J Williams and S J Singh and M D Morgan},
  year = {2000},
  doi = {10.1136/thorax.55.5.439c},
  url = {https://pubmed.ncbi.nlm.nih.gov/10819687/},
  note = {Source identifier: 10819687}
}