1. From the Departments of Diagnostic and Interventional Radiology and Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; DESY, Deutsches Elektronen Synchrotron, Hamburg, Germany; CELLS - ALBA, Synchrotron Light Source, Barcelona, Spain; and Heinrich-Pette-Institut, Leibniz Institute for Experimental Virology, Hamburg, Germany