[1] Beth Israel Deaconess Med Ctr, Dept Radiol, Boston, MA 02215 USA
[2] Lahey Clin Med Ctr, Dept Radiol, Burlington, MA 01803 USA
[3] Univ Colorado, Hlth Sci Ctr, Dept Radiol, Denver, CO 80262 USA
[4] Mayo Clin, Rochester, MN USA
[5] Univ Texas Hlth Sci Ctr San Antonio, Dept Radiol, San Antonio, TX 78284 USA
[6] Massachusetts Gen Hosp, GI GU Div, Dept Radiol, Boston, MA 02114 USA
[7] Middlesex Hosp, London, England
[8] Univ Wisconsin, Ctr Clin Sci, Madison, WI USA
[9] Osped Civile Vimercate, Dept Radiol, Milan, Italy
[10] Univ Calif Davis, Med Ctr, Sacramento, CA 95817 USA
[11] Univ Massachusetts Mem Hlth Care, Dept Radiol, Worcester, MA USA
[12] Hanyang Univ Hosp, Seoul, South Korea
[13] Harvard Univ, Sch Med, Brigham & Womens Hosp, Dept Radiol, Boston, MA USA
[14] Gen Hosp Busto Arsizio, Dept Radiol, Busto Arsizio, Italy
[15] Johann Wolfgang Goethe Univ Hosp, Inst Diagnost Intervent Radiol, Frankfurt, Germany
[16] NIH, Ctr Clin, Bethesda, MD 20892 USA
[17] WA Univ, Sch Med, Mallinckrodt Inst Radiol, St Louis, MO USA
[18] Reading Hosp Med Ctr, Reading, PA USA