@misc{indiciae194328551cb8,
  title = {Functional endoscopic surgery to the sinuses.},
  author = {C A East},
  year = {1989},
  doi = {10.1136/bmj.299.6701.694},
  url = {https://pubmed.ncbi.nlm.nih.gov/2508874/},
  note = {Source identifier: 2508874}
}