From the *Department of Clinical Chemistry, Georg-August University Goettingen, Goettingen, Germany; and †Department of Cardiac Surgery, University of Leipzig, Heart Center Leipzig, Leipzig, Germany. This work was presented at the pre-Congress meeting of the IATDMCT in Louisville in 2005 Received for publication September 5, 2005; accepted October 10, 2005. Reprints: Prof. Dr. med. Dr. h.c. Michael Oellerich, Abt. Klinische Chemie / Zentrallabor, Georg-August-Universität Göttingen, Robert-Koch-Str. 40, D-37099 Göttingen, FRG. (e-mail: [email protected]).