1 Department of Medical Sciences, Public Health and Health Promotion, University of Limpopo, Polokwane, South Africa, INDEPTH Network, Accra, Ghana, marianne.alberts@ul.ac.za.
2 Department of Medical Sciences, Public Health and Health Promotion, University of Limpopo, Polokwane, South Africa.
3 Department of Geography.
4 Physical Activity Epidemiology Laboratory.
5 Department of Education, University of Limpopo, Polokwane, South Africa.
6 WHO Collaborating Centre for Verbal Autopsy, Umeå Centre for Global Health Research, Umeå University, Umeå, Sweden and MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, University of the Witwatersrand, Johannesberg, South Africa.