Healthy Adult Volunteers ages 18-89 needed for study Healthy individuals ages 18-89 are needed for a study exploring the reason why some individuals have an increased risk of forming calcium oxalate kidney stones. You don’t have to have kidney stones to participate. The study involves consuming prepared meals over 4 days and collecting urine and blood. Compensation up to $140. For more information, call 205-934-5712 or email This email address is being protected from spambots. You need JavaScript enabled to view it. or This email address is being protected from spambots. You need JavaScript enabled to view it..