@misc{indiciae1571799faaec,
  title = {Endoscopy compared with barium meal.},
  author = {R M Mendelson},
  doi = {10.5694/j.1326-5377.1989.tb139682.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/2593930/},
  note = {Source identifier: 2593930}
}