@article{barrettconnor1991-1872493,
  author  = {Barrett-Connor, Elizabeth L.},
  title   = {{Postmenopausal Estrogen and Prevention Bias}},
  journal = {Annals of Internal Medicine},
  year    = {1991},
  doi     = {10.7326/0003-4819-115-6-455},
  pmid    = {1872493},
  url     = {https://doi.org/10.7326/0003-4819-115-6-455}
}