<qa>  What is the name of the study that is ancillary to and coordinated with?Aortic calcium measured by computed tomography occurs earlier in life than other subclinical that is, asymptomatic markers of cardiovascular disease CVD, shows a wide range, and is common in women. The large size of the aorta and relative lack of image artifact from motion make it ideal for radiographic quantitative imaging. This study is ancillary to and coordinated with the Multi-Ethnic Study of Atherosclerosis MESA, a large prospective epidemiologic study investigating multiple subclinical CVD measures and CVD risk factors. Subclinical measures in MESA include coronary calcium, carotid ultrasound, cardiac magnetic resonance imaging, and the anklebrachial blood pressure index. The extensive CVD risk factor measurements include both traditional risk factors and newer measures such as inflammatory and genetic markers. 