Following VIDAL trial closure, we will continue to follow this consented cohort passively to assess lifelong health. All data files (the original study data during the trial period along with GP records, hospital admissions, cancer and death registrations) are linked using a unique participant study number all of which is stored in the trial database. Identifying information (e.g. names, contact details, NHS number and date of birth) are stored in separate encrypted files. Our processing activities have been approved by an ethics committee with further permission from NHS Digital to use hospital admission, cancer and death registration data.
The statistical analyses of the data produces tabular or graphical results where no member of the studies could be identified. If you think you participated in the VIDAL Trial and have any questions or wish to withdraw consent for your data being used for this purpose, please e-mail or contact the study team at the London School of Hygiene & Tropical Medicine on telephone number 020 7927 2722.