1. From the Rudolf Virchow Center (U.J.H.S., B.N.), Deutsche Forschungsgemeinschaft Research Center for Experimental Biomedicine, University of Würzburg; Institute for Clinical Immunology and Transfusion Medicine (U.J.H.S.), Justus Liebig University, Giessen; and Institute of Clinical Biochemistry and Pathobiochemistry (B.N.), University of Würzburg, Germany.