[1] Stanford Univ, Sch Med, Div Vasc Surg, 300 Pasteur Dr,Ste H3600, Stanford, CA 94305 USA
[2] Univ Washington, Div Vasc Surg, Seattle, WA 98195 USA
[3] Univ Utah, Sch Med, Div Vasc Surg, Salt Lake City, UT USA
[4] Hawaii Permanente Med Grp, Honolulu, HI USA
[5] Univ Calif Davis, Div Vasc & Endovasc Surg, Sacramento, CA 95817 USA