Figure 1From: The impact of pre- and postnatal exposures on allergy related diseases in childhood: a controlled multicentre intervention study in primary health care Flow of participants in the intervention cohort and control cohort. a Total population of birth cohort in Trondheim during inclusion period. b Q1 = Completed questionnaire on exposures at first antenatal check-up during pregnancy. c Q2 = Completed questionnaires on exposures and health at 2 years of age.Back to article page