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Competing interests None declared.
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↵i There are seven Caldicott Principles which apply to the handling of health data, see—Department of Health (2013) Information: to share or not to share p. 5.
↵ii The Information Commissioner's Office has a code of practice which sets out how data might be sufficiently anonymised that it may be used in controlled circumstances without breaching privacy.
↵iii NHS Digital (formerly the Health and Social Care Information Centre) is the focal point of heath information collection and analysis in England.
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