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The information that we receive is stored securely by Oxford University on a study database. When we analyse the information, your personal details (name, date of birth, NHS number and address), will be removed and replaced by a unique trial ID number. Your data is treated in the strictest confidence and is used solely for academic research purposes. Access to the study database is by unique combinations of usernames and passwords and only authorised study personnel can access information about participants. The University building is also secure with authorised swipe card access only. Importantly, no individuals will be identified in any publications arising from this work.