@misc{indiciae841e94c21d98,
  title = {COPD exacerbations . 2: aetiology.},
  author = {E Sapey and R A Stockley},
  year = {2006},
  doi = {10.1136/thx.2005.041822},
  url = {https://pubmed.ncbi.nlm.nih.gov/16517585/},
  note = {Source identifier: 16517585}
}