@misc{indiciae7aee1b5c3e18,
  title = {Can the 'hygiene hypothesis' be explained by confounding by behavior?},
  author = {C P van Schayck and J A Knottnerus},
  year = {2004},
  doi = {10.1016/j.jclinepi.2003.12.011},
  url = {https://pubmed.ncbi.nlm.nih.gov/15196612/},
  note = {Source identifier: 15196612}
}