Habib Zaidi1,2,3,4. 1. 1 Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital , Geneva , Switzerland. 2. 2 Geneva University Neurocenter, University of Geneva , Geneva , Switzerland. 3. 3 Department of Nuclear Medicine and Molecular Imaging, University of Groningen, University Medical Center Groningen , Groningen , Netherlands. 4. 4 Department of Nuclear Medicine, University of Southern Denmark , Odense , Denmark.