1. From the Institute of Diagnostic Radiology and Neuroradiology (J.P.K., C.H., M.L.K., C.O.S., B.M.), Institute for Community Medicine (P.M., H.V.), and Department of Medicine A, University Medicine (M.M.L., J.M.), Ernst Moritz Arndt University Greifswald, Berthold-Beitz-Platz, 17495 Greifswald, Germany; Department of Radiology, University of Wisconsin, Madison, Wis (D.H., S.B.R.); and Department of Medical Physics, Biomedical Engineering, Medicine and Emergency Medicine, University of Wisconsin, Madison,...