@misc{indiciae1b0dcd17670d,
  title = {Endoscopic ultrasonography.},
  author = {G N Tytgat and P Fockens},
  year = {1992},
  doi = {10.3109/00365529209095984},
  url = {https://pubmed.ncbi.nlm.nih.gov/1439573/},
  note = {Source identifier: 1439573}
}