1 Department of Paediatrics and Child Health, Red Cross War Memorial Children's Hospital, and MRC Unit on Child & Adolescent Health, University of Cape Town, Cape Town, South Africa, Centre of Tropical Medicine and Travel Medicine, Amsterdam Academic Medical Centers, Amsterdam, The Netherlands, Department of Pediatric Pneumology and Immunology, Charité-Universitätsmedizin Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin Institute of Health (BIH), Berlin, Germany Department of Paediatrics and Child Health, Red Cross War Memorial Children's Hospital, and MRC Unit on Child & Adolescent Health, University of Cape Town, Cape Town, South Africa, Centre of Tropical Medicine and Travel Medicine, Amsterdam Academic Medical Centers, location AMC, Amsterdam, The Netherlands Lighthouse Clinic, Lilongwe, Malawi Department of Paediatrics and Child Health, Red Cross War Memorial Children's Hospital, and MRC Unit on Child & Adolescent Health, University of Cape Town, Cape Town, South Africa, Department of Radiology, Children's hospital of Philadelphia, Philadelphia, Pennsylvania Centre of Tropical Medicine and Travel Medicine Amsterdam Academic Medical Centers, Amsterdam, The Netherlands Department of Paediatrics and Child Health, Red Cross War Memorial Children's Hospital, and MRC Unit on Child & Adolescent Health, University of Cape Town, Cape Town, South Africa.