1. Department of Internal Medicine IUniversity of Heidelberg Heidelberg Germany
2. Experimental Immunology BranchNational Cancer InstituteNational Institutes of Health Bethesda Maryland
3. Department of Clinical Chemistry and Molecular DiagnosticsPhilipps‐University Marburg
4. Division of Biochemistry, Faculty of BiosciencesUniversity of Helsinki Finland
5. Department of Pathology and Laboratory MedicineUniversity of Pennsylvania Philadelphia Pennsylvania
6. Institute for BiochemistryJustus‐Liebig‐University Giessen Germany
7. Department of BiochemistryQueen's University Kingston Ontario Canada