[1
]Department of Epidemiology and Gangarosa Department of Environmental Health, Rollins
School of Public Health, Emory University, Atlanta, GA, USA
[2
]Department of Paediatrics and Child Health, Red Cross War Memorial Children’s Hospital,
University of Cape Town, Cape Town, South Africa
[3
]Department of Clinical Research, London School of Hygiene & Tropical Medicine, London,
UK
[4
]Neuroscience Institute, University of Cape Town, Cape Town, South Africa
[5
]Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South
Africa
[6
]South African Medical Research Council (SAMRC) Unit on Child and Adolescent Health,
University of Cape Town, Cape Town, South Africa
[7
]Department of Medical Genetics, University of British Columbia, Vancouver, Canada
[8
]BC Children’s Hospital Research Institute, Vancouver, Canada
[9
]Centre for Molecular Medicine and Therapeutics, Vancouver, Canada
[10
]Department of Biochemistry and Medical Genetics, University of Manitoba, and Children’s
Hospital Research Institute of Manitoba, Winnipeg, Canada
[11
]South African Medical Research Council (SAMRC) Unit on Risk and Resilience in Mental
Disorders, University of Cape Town, Cape Town, South Africa
[12
]Department of Human Genetics, School of Medicine, Emory University, Atlanta, GA, USA