@misc{indiciae228736e751e6,
  title = {Upper gastrointestinal endoscopy.},
  year = {1989},
  doi = {10.7326/0003-4819-110-3-244},
  url = {https://pubmed.ncbi.nlm.nih.gov/2912365/},
  note = {Source identifier: 2912365}
}