1. Department of Internal Medicine and Infectious Diseases, University Medical Centre Utrecht, Utrecht, The Netherlands.
2. Department of Internal Medicine and Infectious Diseases, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands.
3. Department of Psychiatry, University Medical Centre Utrecht, Utrecht, The Netherlands.
4. Department of Psychiatry, Stellenbosch University, Cape Town, South Africa.
5. SAMRC Genomics and Brain Disorders Unit, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.