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Contributed equally to this work with:
Martin W. G. Brinkhof,
Ben D. Spycher
Division of International and Environmental Health, Institute of Social and Preventive Medicine (ISPM), University of Bern, Bern, Switzerland
Division of Biostatistics, Indiana University, Indianapolis, Indiana, United States of America
Lighthouse Trust at Kamuzu Central Hospital and Ministry of Health, Lilongwe, Malawi
Faculty of Health Sciences, Desmond Tutu HIV Centre, Institute for Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
Programme PAC-CI, Abidjan, Côte d'Ivoire
School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa
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Department of Social Medicine, University of Bristol, Bristol, United Kingdom
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