1. Division of Paediatric Pulmonology, Red Cross War Memorial Children’s Hospital, Cape Town, South Africa,
2. Department of Paediatrics and Child Health, University of Cape Town, Cape Town, South Africa,
3. Department of Anaesthesia/Critical care, Uganda Heart Institute, Kampala, Uganda,
4. Department of Paediatrics and Child Health, Kenyatta National Hospital, University of Nairobi, Nairobi, Kenya,