H. van Staden, R. Kemp, and S. Beukes, “Return- to -work(RTW) of Patients after Lumbar Surgery”, SAJOT, vol. 41, no. 3, pp. 70–78, Dec. 2011, Accessed: Apr. 08, 2025. [Online]. Available: https://journals.assaf.org.za/index.php/sajot/article/view/19724