@misc{indiciae756045ea7ed1,
  title = {Privileges to perform endoscopy.},
  author = {M V Sivak},
  doi = {10.1016/s0016-5107(90)70934-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/2311890/},
  note = {Source identifier: 2311890}
}