@misc{indiciae5a3ff0ef18ba,
  title = {What is a normal upper gastrointestinal tract?},
  author = {D G Colin-Jones and P L Golding},
  year = {1991},
  doi = {10.1136/bmj.302.6779.742},
  url = {https://pubmed.ncbi.nlm.nih.gov/2021763/},
  note = {Source identifier: 2021763}
}