[1] Univ Duisburg Essen, Clin Cardiol, W German Heart Ctr Essen, Univ Clin Duisburg Essen, D-45122 Essen, Germany
[2] Univ Duisburg Essen, Inst Med Informat Biometry & Epidemiol, D-45122 Essen, Germany
[3] Cardioangiol Ctr, Frankfurt, Germany
[4] Univ Halle Wittenberg, Inst Med Epidemiol Biometry & Informat, D-4010 Halle, Germany
[5] Univ Duisburg Essen, Dept Endocrinol, Div Lab Res, D-45122 Essen, Germany