[1] Johns Hopkins Univ Hosp, Div Vasc & Endovasc Surg, Baltimore, MD 21287 USA
[2] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[3] Univ N Carolina, Div Vasc & Cardiothorac Surg, Chapel Hill, NC 27515 USA
[4] Univ Minnesota, Div Epidemiol & Community Hlth, Minneapolis, MN USA
[5] Univ N Carolina, Gillings Sch Global Publ Hlth, Dept Epidemiol, Chapel Hill, NC 27515 USA