@misc{indiciaefcec1ae344bd,
  title = {Does sildenafil also improve breathing?},
  author = {N B Charan},
  year = {2001},
  doi = {10.1378/chest.120.1.305},
  url = {https://pubmed.ncbi.nlm.nih.gov/11451855/},
  note = {Source identifier: 11451855}
}