Institution: | a Division of Cardiothoracic Radiology, Department of Radiology, Cardiovascular Center, University of Michigan Medical School, University of Michigan Health System, Room 5481, 1500 East Medical Center Drive, Ann Arbor, MI 48109-5868, USA b Division of Cardiothoracic Radiology, Department of Radiology, Cardiovascular Center, University of Michigan Medical School, University of Michigan Health System, Room 5388, 1500 East Medical Center Drive, Ann Arbor, MI 48109-5868, USA |