@misc{indiciae090040a62d48,
  title = {[Endoscopy units].},
  author = {R J Pérez Serra and L Guzmán and J I Ruiz and J A Blázquez and F J Del Valle},
  year = {1991},
  url = {https://pubmed.ncbi.nlm.nih.gov/1751071/},
  note = {Source identifier: 1751071}
}