To the editor: Comment on Mallol et al.
Renz-Polster
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H
Wall
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D001249:Asthma / Q000453:epidemiology*; D002585:Cesarean Section; D002648:Child; D002669:Child Welfare; D016021:Epidemiologic Studies; D006801:Humans; D006920:Hygiene; D006969:Hypersensitivity, Immediate / Q000209:etiology; D007843:Latin America / Q000453:epidemiology; D015203:Reproducibility of Results; D012307:Risk Factors