Affiliation: | a Division of Vascular and Endovascular Surgery, Department of Surgery, University Of Texas Southwestern Medical School, Dallas, Tex b Division of Vascular Surgery and Endovascular Therapy, Emory University School of Medicine and Surgical Service, Atlanta VA Medical Center, Atlanta, Ga c Department of Surgery, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, Mass d Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Ga |