The participant pool is open for individuals hailing from a majority of OECD countries, creating an inclusive environment for participants to join research studies. However, it's important to note that there are a few exceptions to this general rule. Individuals residing in Turkey, Lithuania, Colombia, and Costa Rica are currently unable to join the participant pool at this time.

Nevertheless, there is one notable exception to this restriction, which is South Africa. Currently, participants from South Africa are eligible and encouraged to join the participant pool, providing an opportunity for diverse perspectives and experiences from this region to contribute to research studies.

Furthermore, participants who reside in non-OECD countries still have the chance to join the participant pool if they happen to live within an OECD country. This provision recognizes that individuals may be temporarily or permanently residing in an OECD country, even if their country of origin is not a member of the OECD. This inclusive approach allows for a broader representation of participants, encompassing a diverse range of backgrounds and nationalities.

In summary, while the participant pool welcomes participants from most OECD countries, specific exclusions apply to Turkey, Lithuania, Colombia, and Costa Rica. However, South Africa stands as an exception to this exclusion, permitting participants from this country to join. Additionally, individuals residing in non-OECD countries still have the opportunity to participate if they reside in an OECD country, promoting inclusivity and diversity within the participant pool.