TY  - RPRT
TI  - Can the 'hygiene hypothesis' be explained by confounding by behavior?
AU  - C P van Schayck
AU  - J A Knottnerus
PY  - 2004
DO  - 10.1016/j.jclinepi.2003.12.011
UR  - https://pubmed.ncbi.nlm.nih.gov/15196612/
ID  - 15196612
ER  -