NOTE: To be eligible for the $25 gas card, it is required that your friend: (1) Pass a phone screening first (2) come into our office for a screening visit, (3) sign a consent form. Once your referral has signed the consent form and confirms you as the person who referred them, you will receive your referral bonus. If friend doesn’t qualify for the first study after signing consent but signs consent for another study, only 1 gas card will be distributed to referring person.