1 Division of Tropical and Humanitarian Medicine, Geneva University Hospitals, Geneva, Switzerland; Faculty of Medicine, University of Geneva, Geneva, Switzerland.
2 Umeå Centre for Global Health Research, Umeå University, Umeå, Sweden; MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
3 Metabiota Inc, Freetown, Sierra Leone; USAID/Predict Program, Freetown, Sierra Leone.
4 Umeå Centre for Global Health Research, Umeå University, Umeå, Sweden; MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; INDEPTH Network, Accra, Ghana.
5 School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Department of Mathematics & Statistics, Njala University, Njala, Sierra Leone; INDEPTH Network, Accra, Ghana.
6 MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Ageing and Health, School of Medicine, University of Dundee, Dundee, UK.
7 MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Centre for Global Health, King's College London, London, UK. Electronic address: justine.davies@kcl.ac.uk.