@misc{indiciaee85c1ab66536,
  title = {A convenient method to identify prior surgical procedures.},
  author = {G S Letterie and J P Bruner and A P Sarno},
  year = {1990},
  doi = {10.1016/0002-9378(90)91156-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/2403144/},
  note = {Source identifier: 2403144}
}