Funding for this research was provided by:
National Research Foundation (99079)
Poliomyelitis Research Foundation (15/18)
Rand Water (Rand Water Chair in Public Health)
Article History
Received: 2 June 2017
Accepted: 29 July 2017
First Online: 4 August 2017
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
Free to read: This content has been made available to all.