Affiliation: | aCentre for International Health, University of Otago, Dunedin, New Zealand.;bBacterial Diseases Programme, Medical Research Council Laboratories, Banjul, the Gambia.;cInstitute of Development Studies, University of Sussex, Brighton, England.;dInfectious Diseases Epidemiology Unit, London School of Hygiene and Tropical Medicine, London, England. |