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by Hecker, Hans-ulrich; Liebchen, Kay; Lueders, Katja; et al.
by Hecker, Hans-Ulrich, M.D.; Steveling, Angelika, M.D.; Peuker, Elmar T., M.D.; et al.
by Hecker, Hans
by Hecker, Hans-Joachim
by Hecker, Hans-Joachim; Heusler, Andreas; Stephan, Michael
by Hans-Ulrich Hecker
by Hecker, Hans-Ulrich
by Hecker, Hans-ulrich; Steveling, Angelika; Peuker, Elmar