The magnitude of the effect of smaller family sizes on the increase in the prevalence of asthma and hay fever in the United Kingdom and New Zealand.
J Allergy Clin Immunol. 1999 Sep;104(3 Pt 1):554-8. doi: 10.1016/s0091-6749(99)70323-4.
J Allergy Clin Immunol. 1999.
PMID: 10482827