@misc{indiciaef770fb913d6c,
  title = {Occult blood.},
  author = {F O Stephens and K B Lawrenson},
  year = {1970},
  doi = {10.1016/s0140-6736(70)91390-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/4195245/},
  note = {Source identifier: 4195245}
}