Affiliation: | 3. From the Department of Biochemistry, Children''s Hospital, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;;4. Waters Corporation, Wilmslow, SK9 4AX, United Kingdom;;5. Department of Medical Biochemistry, Leiden Institute of Chemistry, Leiden University, Leiden, 2333 CC, The Netherlands;;6. Institut für Biochemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany; |