Funding for this research was provided by:
Council for Scientific and Industrial Research, South Africa (Parliamentary Grant)
HERCULES Center (P30ES019776)
Received: 2 August 2019
Accepted: 6 December 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: This study was based on routinely collected and de-identified mortality data. It was determined that IRB review was not required by using Emory University’s IRB non-human subjects research determination tool.
: Not applicable.
: The authors declare that they have no competing interests.