1 Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia.
2 Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, UK.
3 Centre for Respiratory Diseases Research, Kenya Medical Research Institute (KEMRI), Nairobi, Kenya.
4 Epidemiological Laboratory (Epi-Lab) for Public Health, Research and Development, Khartoum, Sudan.
5 Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, UK, Centre for Health Solutions-Kenya, Nairobi, Kenya.
6 Education for Health Africa, Durban, South Africa.
7 Division of Epidemiology Biostatistics, School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa.
8 University of California, San Francisco, CA, USA.
9 National Heart and Lung Institute, Imperial College London, London, UK.
10 Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, UK, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK, University of Cambridge, Cambridge, UK.