In my study participants must enter their email adress first, in a double opt-in procedure, to receive a link via email to access the questionnaire.
I know that using this method the email adresses are stored in a seperate database from the answers and I also know that by selecting pseudonym in the privicy section, participants gen an ID number in the database that stores the email adresses and a SERIAL code, in the database that stores the answers.
I want to know if, lets say, a participant asks for their data to be removed from the set (before the statistical analisis) I, as the admin of the questionnaire, can actually match their ID to their SERIAL and detele their answers.
I am asking this because I need to explain if this is a possibility to my ethics commitee.
Thank you!