@misc{indiciae93c50f8aa356,
  title = {COPD exacerbations: definitions and classifications.},
  author = {S Burge and J A Wedzicha},
  year = {2003},
  doi = {10.1183/09031936.03.00078002},
  url = {https://pubmed.ncbi.nlm.nih.gov/12795331/},
  note = {Source identifier: 12795331}
}