1. Kheth'Impilo, Green Square, 37 Hares Crescent, Woodstock, 7925, Cape Town, South Africa
2. Lung Clinical Research Unit, University of Cape Town Lung Institute, George Street, Mowbray, Cape Town, South Africa
3. Primary Healthcare Directorate, University of Cape Town, Groote Schuur Hospital, Observatory, Cape Town, South Africa
4. Paediatric Infectious Diseases Unit, Red Cross Children's Hospital, School of Child and Adolescent Health, University of Cape Town, Klipfontein Road, Rondebosch, Cape Town, South Africa