1 Department of Medicine, Faculty of Clinical Sciences, College of Medicine, University of Lagos, and The Lagos University Teaching Hospital, Lagos, Nigeria.
2 Department of Medicine, Douala General Hospital, University of Douala, Douala, Cameroon.
3 Department of Paediatrics and Child Health, Red Cross War Memorial Children's Hospital and SA-MRC Unit for Child and Adolescent Health, University of Cape Town, Cape Town, South Africa.
4 Department of Paediatrics and Child Health, School of Clinical Medicine, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa.
5 Centre for Child Health, Blizard Institute, Queen Mary University of London, London, United Kingdom.
6 Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, United Kingdom.
7 Department of Medicine, Dermatology and Therapeutics, Kenyatta University, Nairobi, Kenya.