@misc{indiciae6d20a6c1943f,
  title = {Ecologic studies in epidemiology: concepts, principles, and methods.},
  author = {H Morgenstern},
  year = {1995},
  doi = {10.1146/annurev.pu.16.050195.000425},
  url = {https://pubmed.ncbi.nlm.nih.gov/7639884/},
  note = {Source identifier: 7639884}
}