Queen Mary University of London, Queen Mary University of London - Barts and The London School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, Ghana - School of Medicne and Dentistry, University of Lagos - Department of Medicine, Komfo Anokye Teaching Hospital, Queen Mary University of London - Centre for Oral immunobiology and Regenerative Medicine, Queen Mary University of London - Asthma UK Centre for Applied Research, University of Zimbabwe Faculty of Medicine and Health Sciences, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, University of KwaZulu-Natal, Department of Paediatrics, University of Zimbabwe, University of Zimbabwe Faculty of Medicine and Health Sciences, Makerere University - Makerere University Lung Institute, University of Malawi - Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Lagos State University - College of Medicine, Komfo Anokye Teaching Hospital, University of Zimbabwe Faculty of Medicine and Health Sciences, Lagos State University of Science and Technology, Lagos State University, Education for Health Africa, University of KwaZulu-Natal - Department of Paediatrics and Child Health and Queen Mary University of London - Centre for Genomics and Child Health