@misc{indiciae86f829b7e5bb,
  title = {Chronic obstructive pulmonary disease.},
  author = {P M A Calverley and Paul Walker},
  year = {2003},
  doi = {10.1016/s0140-6736(03)14416-9},
  url = {https://pubmed.ncbi.nlm.nih.gov/14522537/},
  note = {Source identifier: 14522537}
}