We understand that you may be interested in your test results. However, because this is a research study, individual results…

You are allowed to answer the electronic survey questions every year but you will only be paid two times ($50,…

The in-person visit will take about a day, and the online survey for Tier 1 takes less than an hour.

For Tier 1, you will receive a check in the mail 4-6 weeks following study completion. For Tier 2, you…