PMC:4137988 / 45021-45104 JSONTXT

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{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/4137988","sourcedb":"PMC","sourceid":"4137988","source_url":"https://www.ncbi.nlm.nih.gov/pmc/4137988","text":"Age, sex, environmental tobacco smoke, parental atopy, exercise, number of siblings","tracks":[]}