@misc{indiciaeff1e8fb07bb6,
  title = {Fibreoptic colonoscope.},
  author = {B F Overholt},
  year = {1970},
  doi = {10.1016/s0140-6736(70)91119-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/4191953/},
  note = {Source identifier: 4191953}
}