When you cannot log in to the questionnaire this could be due to various reasons.
Firstly, it is important that you use your personal (written) invitation, this contains the code with which you can log in to the digital questionnaire.
It could also be that you have accidentally not accurately copied your log in details. In your invitation, the log in details are in the grey section, you must copy this entirely when logging in to the questionnaire.
If you do not succeed in logging in, please contact one of our employees using the contact button on the start page.