Daley, D (October 2014). "The evolution of the hygiene hypothesis: the role of early-life exposures to viruses and microbes and their relationship to asthma and allergic diseases". Current Opinion in Allergy and Clinical Immunology. 14 (5): 390–396. doi:10.1097/ACI.0000000000000101. PMID25102107. S2CID45420527.
Daley, D (October 2014). "The evolution of the hygiene hypothesis: the role of early-life exposures to viruses and microbes and their relationship to asthma and allergic diseases". Current Opinion in Allergy and Clinical Immunology. 14 (5): 390–396. doi:10.1097/ACI.0000000000000101. PMID25102107. S2CID45420527.
Daley, D (October 2014). "The evolution of the hygiene hypothesis: the role of early-life exposures to viruses and microbes and their relationship to asthma and allergic diseases". Current Opinion in Allergy and Clinical Immunology. 14 (5): 390–396. doi:10.1097/ACI.0000000000000101. PMID25102107. S2CID45420527.