For families in phase 1 of the study, the survey agency has securely deleted your contact details and other information from birth registration and / or health records at the end of their contract. .
If you participated in the study, the survey agency provided UCL with the contact details collected directly from you, not those from your birth and/or health records. UCL will continue to hold your contact details provided in the interview, as well as your survey responses
For families in phase 1 of the study, in England, Scotland and Wales, the survey agency provided UCL with other fields from birth and / or health records for all families invited to the study, whether or not they took part. This information was retained for a limited amount of time to understand who does and doesn’t take part in the study and has now been securely deleted .