Funding for this research was provided by:
Nelson Mandela Metropolitan University
Sappi forests
Article History
Received: 8 May 2017
Accepted: 12 July 2017
First Online: 31 July 2017
Compliance with ethical standards
:
: Nelson Mandela Metropolitan University and Sappi forests were responsible for funding the research project.
Free to read: This content has been made available to all.