@misc{indiciae6967ce588a27,
  title = {Controlled trial of supervised exercise training in chronic bronchitis.},
  author = {D J Sinclair and C G Ingram},
  year = {1980},
  doi = {10.1136/bmj.280.6213.519},
  url = {https://pubmed.ncbi.nlm.nih.gov/6989433/},
  note = {Source identifier: 6989433}
}