1. From Warwick Medical School, Warwick University, Coventry, United Kingdom; Liverpool School of Tropical Medicine, International Health Group, Liverpool, United Kingdom; Stellenbosch University, Stellenbosch, South Africa; South African Medical Research Council, Tygerberg, South Africa; University Medical Center Utrecht, Utrecht, The Netherlands; Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland; University College London, London, United Kingdom;
2. and University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania.