1. Department of Imaging and Pathology, Medical Imaging Research Center (MIRC), Nuclear Medicine and Molecular Imaging, University of Leuven (KU Leuven), Leuven, Belgium
2. Department of Nuclear Medicine, Vrije Universiteit Brussel, Brussels, Belgium
3. Department of Physics of Molecular Imaging Systems, Institute for Experimental Molecular Imaging, RWTH Aachen University, Aachen, Germany
4. Department of Biomedical Engineering and the Department of Radiology, UC Davis, Davis, CA, USA
5. Instituto de Instrumentacion Imagen Molecular, Centro Mixto CSIC, Polytechnic University of Valencia, Valencia, Spain