1. Department of Clinical Research, London School of Hygiene and Tropical Medicine, London, United Kingdom
2. Tuberculosis Modelling Group, Tuberculosis Centre, London School of Hygiene and Tropical Medicine, London, United Kingdom
3. Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom
4. Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre, Malawi