Charlotte Braun-Fahrländer. “Environmental Exposure to Endotoxin and Other Microbial Products and the Decreased Risk of Childhood Atopy: Evaluating Developments since April 2002”. Current Opinion in Allergy and Clinical Immunology 3, № 5 (2003); F. Horak et al. “Parental Farming Protects Children Against Atopy: Longitudinal Evidence Involving Skin Prick Tests”. Clinical and Experimental Allergy 32, № 8 (2002).
