1. Institute of Clinical Chemistry and Laboratory MedicineCentral LaboratoryWestphalian Wilhelms University D-48129 Münster Germany
2. Institute of Arteriosclerosis Research D-48149 Münster Germany
3. Institute of Pharmacological SciencesUniversity of Milan I-20133 Milano Italy
4. Institute of PhysiologyWestphalian Wilhelms University D-48129 Münster Germany