@misc{indiciae02357fe2e402,
  title = {Advanced training in gastrointestinal endoscopy.},
  author = {M V Sivak},
  doi = {10.1016/s0016-5107(92)70346-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/1612391/},
  note = {Source identifier: 1612391}
}