@misc{indiciae029d3d06965f,
  title = {Lower esophageal ring. 1.},
  author = {R K Goyal and J J Glancy and H M Spiro},
  year = {1970},
  doi = {10.1056/nejm197006042822305},
  url = {https://pubmed.ncbi.nlm.nih.gov/4909920/},
  note = {Source identifier: 4909920}
}