@misc{indiciaef1dbf48a5d46,
  title = {Tests for occult blood.},
  author = {R G SIMPSON},
  year = {1963},
  doi = {10.1136/bmj.1.5338.1162},
  url = {https://pubmed.ncbi.nlm.nih.gov/13977569/},
  note = {Source identifier: 13977569}
}