@misc{indiciae3a44b1a1b96a,
  title = {Spacer devices.},
  author = {M S Stulbarg},
  year = {1986},
  doi = {10.1378/chest.89.6.902a},
  url = {https://pubmed.ncbi.nlm.nih.gov/3709261/},
  note = {Source identifier: 3709261}
}