Our recruitment team sends out invitations via snail mail or email on a weekly basis. If a twin is potentially interested, we extend the invitation to the other member of the twin pair. Once both twins have consented to participate, we enroll the pair in the UW Twin Registry.
Periodically, Twin Registry members are invited to participate in new studies developed by prominent scientists around the world. In any such study, participation is completely voluntary and participants may withdraw at any time. Some of our studies involve in-person visits or telephone interviews, while others are conducted entirely through the mail. This diversity in study design allows us to include twins no matter where they currently live.