1. Department of Paediatrics, Komfo Anokye Teaching Hospital, Kumasi, Ghana
2. Department of Paediatrics, Millitary Hospital, Accra, Ghana
3. Department of Paediatrics, Greater Accra Regional Hospital, Accra, Ghana,
4. Department of Paediatrics, Division of Paediatric Pulmonology, Red Cross War Memorial Children’s Hospital, University of Cape Town, Rondebosch, Cape Town, South Africa,