1 Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium-University Hospital Essen, Essen, Germany; and wolfgang.fendler@uk-essen.de.
2 Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium-University Hospital Essen, Essen, Germany; and.
3 Department of Nuclear Medicine, Technical University of Munich, Munich, Germany.