@misc{indiciae82f55cd0600f,
  title = {OPCAB selection bias.},
  author = {M A Wait},
  year = {2001},
  doi = {10.1016/s0003-4975(01)02483-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/11383853/},
  note = {Source identifier: 11383853}
}