1. From the Divisions of Cardiovascular and Thoracic Radiology (M.A.W., H.K., M.I., D.R., V.G.), Cardiovascular Medicine (M.A.W., A.R.E., V.G.), and Vascular Surgery (M.S.), and Departments of Obstetrics and Gynecology (D.R.) and Family and Community Medicine (M.S.), University of Kentucky Chandler Medical Center, UK HealthCare Enterprise, 800 Rose St, Room HX-313A, Lexington, KY 40536-0293.