

@article {6810,
	title = {Hygiene hypothesis: {Fact} or fiction?},
	journal = {Journal of Allergy and Clinical Immunology},
	volume = {111},
	number = {3},
	year = {2003},
	month = {mar},
	pages = {471{\textendash}478},
	issn = {00916749},
	doi = {10.1067/mai.2003.172},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S0091674902914910},
	author = {Liu, Andrew H. and Murphy, James R.}
}
