@misc{indiciaeff6033bb61a8,
  title = {Occult blood tests.},
  author = {J D Hardcastle and W M Thomas},
  year = {1989},
  doi = {10.1016/s0140-6736(89)90910-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/2570915/},
  note = {Source identifier: 2570915}
}