The authors would like to apologise for errors made in the authors’ institutional affiliations.

The original article referred to F. Xavier Gómez-Olivé as part of the Department of African American Studies and Sociology, University of Maryland, College Park, USA, which is incorrect. In fact, Dr Gómez-Olivé is part of the 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.

Similarly, the original article referred to Mark A. Collinson as a member of the Department of African American Studies and Sociology, University of Maryland, College Park, USA, which is incorrect. In fact, he is part of the 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, as well as the Department of Science and Technology/Medical Research Council, South African Population Research Infrastructure Network, Johannesburg, South Africa and the Migration, Urbanisation and Health Working Group, INDEPTH Network, Accra, Ghana.