@misc{indiciaee4ca9fbb2ff5,
  title = {COPD exacerbations.},
  author = {M C Haggerty},
  year = {2001},
  doi = {10.1136/thorax.56.9.740},
  url = {https://pubmed.ncbi.nlm.nih.gov/11563358/},
  note = {Source identifier: 11563358}
}