[1] Univ Michigan, Cardiothorac Imaging Div, Dept Radiol, Taubman Ctr B1-132D,1500 E Med Ctr Dr, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Radiol, Abdominal Imaging Div, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Dept Radiol, Michigan Radiol Qual Collaborat, Ann Arbor, MI 48109 USA