@misc{indiciaed67259575988,
  title = {Ecological bias and confounding.},
  author = {S Richardson and D Hémon},
  year = {1990},
  doi = {10.1093/ije/19.3.764},
  url = {https://pubmed.ncbi.nlm.nih.gov/2262279/},
  note = {Source identifier: 2262279}
}