@misc{indiciae4d9cb6dba545,
  title = {Upper esophageal ring.},
  author = {P B Lesser and P Moyer and P J Andrews and J R Dreyfuss},
  year = {1978},
  doi = {10.7326/0003-4819-88-5-657\_2},
  url = {https://pubmed.ncbi.nlm.nih.gov/646256/},
  note = {Source identifier: 646256}
}