1 Julius Global Health, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, The Netherlands; School of Public Health, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana. Electronic address: d.boateng@umcutrecht.nl.
2 Department of Public Health, Academic Medical Center, University of Amsterdam, Amsterdam Public Health Research Institute, The Netherlands.
3 Non-communicable Disease Research Unit, South African Medical Research Council, Cape Town, South Africa.
4 Julius Global Health, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, The Netherlands.
5 Julius Global Health, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, The Netherlands; Division of Epidemiology & Biostatistics, School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.