1. Department of Psychology, University of Cape Town, Cape Town, South Africa
2. Department of Psychiatry, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
3. Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
4. Centre for Statistical Consultation, Department of Statistics and Actuarial Sciences, Stellenbosch University, Stellenbosch, South Africa
5. Allegheny Health Network, Drexel University College of Medicine, Pittsburgh, PA, USA