[1] Ohio State Univ, Wexner Med Ctr, Div Vasc & Intervent Radiol, Dept Radiol, 395 West 12th Ave, Columbus, OH 43210 USA
[2] Univ Louisville, Dept Biol, Louisville, KY USA
[3] Univ Washington, Dept Radiol, Div Intervent Radiol, 1959 Northeast Pacific St, Seattle, WA 98195 USA
[4] Indiana Univ, Sch Med, Dept Radiol & Imaging Sci, Indianapolis, IN USA
[5] UCLA, Med Ctr, Div Vasc & Intervent Radiol, Dept Radiol, Los Angeles, CA USA