@misc{indiciae91af419e7c44,
  title = {Commentary: observation versus intervention--what's different?},
  author = {Elizabeth Barrett-Connor},
  year = {2004},
  doi = {10.1093/ije/dyh123},
  url = {https://pubmed.ncbi.nlm.nih.gov/15166202/},
  note = {Source identifier: 15166202}
}