There are very clear and strict regulations around storing sensitive data. This includes only storing the minimum amount of data that you require in order to conduct your study and that the data is as untraceable as possible. 

All records will be stored digitally on password-protected, encrypted servers. Additionally, only people who are required to view and analyse the data will be given access. 

These procedures will be regularly reviewed to ensure they comply with the latest advice and regulations for sensitive data storage.