@misc{indiciae80c255709d2f,
  title = {Peroral endoscopy.},
  author = {F J PUTNEY and J J O'KEEFE and L H CLERF},
  year = {1950},
  doi = {10.1001/archotol.1950.00700030309018},
  url = {https://pubmed.ncbi.nlm.nih.gov/15433690/},
  note = {Source identifier: 15433690}
}