Affiliations

• ¹ Medical Research Council Clinical Trials Unit, University College London, London, UK; Institute for Global Health, University College London, London, UK; Wellcome Centre for Infectious Diseases Research in Africa, Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Cape Town, South Africa. Electronic address: h.esmail@ucl.ac.uk.
• ² University College London Respiratory, Division of Medicine, University College London, London, UK.
• ³ Medical Research Council Clinical Trials Unit, University College London, London, UK.
• ⁴ Nuffield Department of Medicine, University of Oxford, Oxford, UK.