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Emmanouil Fokas and Claus Rödel, University of Frankfurt, Frankfurt; Torsten Liersch, Tim Beissbarth, Clemens Hess, Heinz Becker, and Michael Ghadimi, University Medical Center Göttingen, Göttingen; Rainer Fietkau, Werner Hohenberger, Susanne Merkel, and Rolf Sauer, University of Erlangen, Erlangen; Hans-Rudolf Raab, Oldenburg Hospital, Oldenburg; Christian Wittekind, University Hospital Leipzig, Leipzig, Germany; and Karl Mrak, Krankenhaus der Barmherzigen Brüder, St Veit, Austria.