[1] Univ Texas, Ctr Hlth Sci, Dept Radiol, Div Cardiovasc & Special Intervent, San Antonio, TX 78285 USA
[2] Univ Texas, Ctr Hlth Sci, Dept Med, Div Gastroenterol, San Antonio, TX 78285 USA
[3] Univ Texas, Ctr Hlth Sci, Dept Pathol, San Antonio, TX 78285 USA
[4] Ohio State Univ, Div Intervent Radiol, Dept Radiol, Columbus, OH 43210 USA
[5] E Carolina Univ, Dept Radiol Vasc & Intervent Radiol, Greenville, NC USA