Colorectal cancer screening: you can't be positive about a negative result.

@article{Hoey2001ColorectalCS,
  title={Colorectal cancer screening: you can't be positive about a negative result.},
  author={J. Joseph Hoey and Eric Wooltorton},
  journal={CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne},
  year={2001},
  volume={165 9},
  pages={1248}
}