@misc{indiciaec4c89fddff84,
  title = {Fiberoptic stomoscopy.},
  author = {C J Lightdale and G Posner and P Sherlock and S J Winawer},
  year = {1973},
  doi = {10.1016/s0016-5107(73)74004-9},
  url = {https://pubmed.ncbi.nlm.nih.gov/4699353/},
  note = {Source identifier: 4699353}
}