[1] Univ Stellenbosch, MRC Unit Anxiety & Stress Disorders, Cape Town, South Africa
[2] Univ Stellenbosch, Dept Paediat & Child Hlth, Cape Town, South Africa
[3] Tygerberg Childrens Hosp, Cape Town, South Africa
[4] Univ Stellenbosch, Dept Psychiat, Cape Town, South Africa
[5] Univ Witwatersrand, Meningeal Pathogens Res Unit, Johannesburg, South Africa
[6] PMRC Univ Witwatersrand Resp, Johannesburg, South Africa