[1] Univ Duisburg Essen, Dept Endocrinol, Essen, Germany
[2] Univ Duisburg Essen, Div Lab Res, Essen, Germany
[3] Univ Halle Wittenberg, Dept Internal Med, Halle, Germany
[4] Univ Halle Wittenberg, Dept Surg, Halle, Germany
[5] Univ Duisburg Essen, Dept Nucl Med, Essen, Germany