@misc{indiciae19db51491dc4,
  title = {Minimal clinically important difference--exacerbations of COPD.},
  author = {Peter M A Calverley},
  year = {2005},
  doi = {10.1081/copd-200050647},
  url = {https://pubmed.ncbi.nlm.nih.gov/17136975/},
  note = {Source identifier: 17136975}
}