(iii) Subjects already enrolled in the study that underwent IMT scan for the baseline visit will be selected as candidates for this procedure. Patients who meet the above criteria will be selected form both the "intervention" and "usual care" group; contacted by mail/phone and asked to participate in this portion of the study. If, they agree, patients will be given a new consent form to sign and after the consenting is done, an appointment for the CAC scan is made.