@misc{indiciaed4cacbc19fd9,
  title = {Strictures, rings, webs and spasm.},
  author = {D A Edwards},
  year = {1974},
  doi = {10.1136/pgmj.50.582.213},
  url = {https://pubmed.ncbi.nlm.nih.gov/4449771/},
  note = {Source identifier: 4449771}
}