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.
Dotterud et al. BMC Public Health 2013 13:123 doi:10.1186/1471-2458-13-123