1 Department of Psychiatry, Collaborative Antwerp Psychiatric Research Institute (CAPRI), Faculty of Medicine and Health Sciences, University of Antwerp, Campus Drie Eiken, Wilrijk, Belgium.
2 Department of Psychiatry, Radboud University Medical Centre, HB Nijmegen, The Netherlands.
3 Department of Internal Medicine, University Hospital of Antwerp, Edegem, Belgium.
4 University of Antwerp, Campus Drie Eiken, Wilrijk, Belgium.