1. Department fo International Health, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe St., Baltimore, MD 21205, USA
2. Center for Global Non-Communicable Disease Research and Training, Johns Hopkins School of Medicine, 1830 E. Monument St., Baltimore, MD 21205, USA
3. Division of Pulmonary and Critical Care, Johns Hopkins School of Medicine, 1830 E. Monument St., Baltimore, MD 21205, USA
4. College of Health Sciences Lung Institute, Makerere University, Upper Mulago Hill Road, Kampala, Uganda
5. Department of Medicine, College of Health Sciences, Makerere University, Upper Mulago Hill Road, Kampala, Uganda
6. Department of Physiology, College of Health Sciences, Makerere University, Upper Mulago Hill Road, Kampala, Uganda
7. UCL Respiratory, University College London, Gower Street, London, WC1E 6BT, UK