1 Department of Nuclear Medicine, Universitätsklinikum Essen, Essen, Germany ken2404@web.de.
2 Department of Molecular and Medical Pharmacology, University California of Los Angeles, Los Angeles, California.
3 Toronto Joint Department Medical Imaging, University Health Network, Sinai Health System, Women's College Hospital, Department Medical Imaging University of Toronto, Toronto, Canada; and.
4 Department of Nuclear Medicine, Technical University München, Munich, Germany.