@misc{indiciae61e1303be44f,
  title = {Surgeon-related variables.},
  author = {K McPherson},
  year = {1978},
  doi = {10.1016/s0140-6736(78)91674-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/81969/},
  note = {Source identifier: 81969}
}