If you collect your first urine of the morning, the study staff will give you 3 plastic collection cups and 3 small tubes filled with a preservative solution. To collect your first morning urine, you will fill the collection cup with urine up to the 100 mL (milliliter) line, add 1 of the small tubes of preservative to the cup within 10 minutes, and then mark on the container that this is your first morning urine. If possible, fill the other 2 collection cups, adding a tube of preservative to each as just described and mark them as part of your first morning urine. You will return the collection cups to the study staff at your next visit.