@misc{indiciae71017e3afac7,
  title = {Assessing cause and effect from trials: a cautionary note.},
  author = {D Howel and R Bhopal},
  year = {1994},
  doi = {10.1016/0197-2456(94)90030-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/8001354/},
  note = {Source identifier: 8001354}
}