1. Department of Nuclear Medicine and Molecular Imaging; University of Groningen, University Medical Center Groningen; Groningen The Netherlands
2. Neurobiology Research Unit, Rigshospitalet and University of Copenhagen; Copenhagen Denmark
3. Department of General Psychiatry, University Center of Psychiatry, University of Groningen, University Medical Center Groningen; Groningen The Netherlands
4. Department of Behavioral Physiology; Center for Behavior and Neurosciences, University of Groningen; Groningen The Netherlands