@misc{indiciaeb7760e27fb26,
  title = {The lower esophageal ring.},
  author = {C HELMUS},
  year = {1960},
  doi = {10.1001/archotol.1960.03770040014002},
  url = {https://pubmed.ncbi.nlm.nih.gov/14400931/},
  note = {Source identifier: 14400931}
}