1 Department of Nuclear Medicine and Molecular Imaging, University Medical Centre Groningen, University of Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands ; Department of Nuclear Medicine, University of Pretoria, Pretoria, South Africa.
2 Department of Nuclear Medicine and Molecular Imaging, University Medical Centre Groningen, University of Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands.
3 Department of Nuclear Medicine, University of Pretoria, Pretoria, South Africa.
4 Department of Nuclear Medicine and Molecular Imaging, University Medical Centre Groningen, University of Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands ; Department of Psychiatry, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands.