Fig. 1From: Trimester effects of source-specific PM10 on birth weight outcomes in the Avon Longitudinal Study of Parents and Children (ALSPAC)The ALSPAC enrolment and geocoding of address locations flow diagram [26, 27]. a The ALSPAC Eligible Study Area; the study area within the UK and details illustrating the three eligible NHS District Health Authorities (DHAs).© Crown Copyright/database right 2011. An Ordnance Survey/EDINA supplied service. b The ALSPAC enrolment, geocoding of address locations flow diagram.Back to article page