AUTHOR CONTRIBUTIONS
Khuthala
Shane A. Norris, Mark A. Hanson, Catherine E. Draper, and Larske M. Soepnel contributed to conceptualization and design of this study. Catherine E. Draper and Gugulethu Mabena contributed to data acquisition. Larske M. Soepnel, Catherine E. Draper, and Khuthala Mabetha performed data analysis. Larske M. Soepnel wrote the initial manuscript with input from all authors on analytical methods, writing, and critical review. All authors approved the final manuscript.