1. Department of Endocrinology and Metabolism (S.L., C.K., D.Z., D.F., L.C.M.), 45141 Essen, Germany
2. Institute of Cell Biology (Cancer Research) Faculty of Medicine (.K.-H.), 45141 Essen, Germany
3. Department of Hematology (C.K.), 45141 Essen, Germany
4. Department of Nuclear Medicine (T.D.P.), 45141 Essen, Germany
5. Institute of Pathology (K.W.S.), University of Duisburg-Essen, 45141 Essen, Germany