Participants will be randomly assigned to receive 4 mg of pitavastatin or placebo once a day for the entire time they are enrolled in the study. Study visits will occur at study entry (Day 0) and Months 1 and 4. Starting at Month 4, study visits will occur every 4 months for the rest of the study. Depending on when participants enroll, they will be in the study for a total of 3 ½ to 6 years. Study visits will include medical and medication history reviews, physical examinations, blood collections, assessments and questionnaires, urine collections (for some participants), and an electrocardiogram (ECG) (at study entry only).