title: To the editor: Comment on Mallol et al.
authors.forename: H
authors.initials: H
authors.lastname: Renz-Polster
authors.forename: M
authors.initials: M
authors.lastname: Wall
mesh_terms: 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