@misc{indiciaef7c3e3821e73,
  title = {Case-crossover studies.},
  author = {Nino Künzli and Christian Schindler},
  year = {2005},
  doi = {10.1097/01.ede.0000165792.14924.f1},
  url = {https://pubmed.ncbi.nlm.nih.gov/15951685/},
  note = {Source identifier: 15951685}
}