1. Laboratory of Cell Pharmacology (K.J., M.B., C.D.), University of Leuven, Medical School, Gasthuisberg, B-3000 Leuven, Belgium
2. Department of Nuclear Medicine (S.W., K.K.), University Hospital of the University of Münster, D-48129 Münster, Germany
3. European Institute of Molecular Imaging (S.W., K.K.), D-48149 Münster, Germany