From SpinozaWiki

For studies at the Spinoza Centre, researchers can make use of the Sona subject registration system.

It is allowed to send an email to the entire Sona participant database with a maximum of one email per year per researcher.

For sending an email to specific subgroups, you will need approval from the Medical Ethical Commission/Ethics Review Board.

A Sona manual for researchers can be found here

If you have any questions please send an email to [email protected].