Funding for this research was provided by:
Water Research Commission (K5/2728)
National Research Foundation (113849)
Article History
Received: 11 October 2018
Revised: 8 November 2018
Accepted: 12 November 2018
First Online: 19 November 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: This article does not contain any studies with human participants or animals performed by any of the authors.