@misc{indiciae90684aeaf9e2,
  title = {Screening sigmoidoscopy-- how often and how good?},
  author = {Robert H Fletcher},
  year = {2003},
  doi = {10.1001/jama.290.1.106},
  url = {https://pubmed.ncbi.nlm.nih.gov/12837719/},
  note = {Source identifier: 12837719}
}